• Introduction
• Rackspace Hosted Exchange: What Happened, and What It Means for You
• Why Migrate from Rackspace to Office 365?
• Rackspace vs Microsoft 365: Feature Comparison
• Migration Methods: IMAP, Hosted Exchange, or Hybrid?
• Benefits of Migrating from Rackspace to Office 365/ Microsoft 365
• Prerequisites Before Starting Rackspace to Office 365 Migration
• Steps for Migrating Emails from Rackspace to Office 365
• Case Study: 131-Mailbox Equipment Supplier Migration
• Common Issues During Migration and How to Fix Them
• Rackspace to Office 365 Migration Checklist
• Rackspace to Office 365 Migration Cost Considerations
• Post-Migration Best Practices
• Migrating Rackspace to Office 365: Is it a Good Idea?
• Frequently Asked Questions on Rackspace to Office 365 Migration

Rackspace Email has long been a dependable hosting service for businesses that need paid email addresses tied to their own domain. It was, for many years, a preferred choice for small and mid-sized companies that wanted reliable email without managing their own servers. But the landscape has shifted. As organizations lean more heavily on real-time collaboration, file sharing, and integrated productivity tools, a growing number of Rackspace customers are choosing to migrate from Rackspace to Office 365 (now branded Microsoft 365). The reason is straightforward: most employees already know Outlook, Word, Excel, and Teams, and Microsoft’s applications are built to work together instead of as separate, disconnected tools.

A Rackspace to Office 365 migration is a strategic move, not just a technical one. It involves transferring mailboxes, contacts, calendars, and often shared resources from Rackspace’s infrastructure into Microsoft’s cloud ecosystem, including Exchange Online, SharePoint, OneDrive, and Microsoft Teams. Whether you’re planning a straightforward Rackspace to Office 365 migration or a more complex Rackspace Hybrid to Office 365 migration, understanding the process end to end, including what can go wrong, is the difference between a smooth weekend cutover and a week of support tickets.

Free migration assistance is available for moving Rackspace email to Office 365. Get in touch with a migration specialist →

Rackspace Hosted Exchange: What Happened, and What It Means for You

If you’re on Rackspace Hosted Exchange, there’s important context worth knowing. On December 2, 2022, Rackspace’s Hosted Exchange environment was hit by a ransomware attack, later attributed to the Play ransomware group exploiting a previously unknown vulnerability in Microsoft Exchange (CVE-2022-41080). The outage took down email access for a large share of Rackspace’s Hosted Exchange customer base for days. During the incident, Rackspace itself advised affected customers to move to Microsoft 365 as the fastest path back to working email, and offered temporary Microsoft 365 access to those impacted.

Following its forensic investigation, Rackspace confirmed it would permanently discontinue Hosted Exchange rather than rebuild the environment, and has been directing customers toward Microsoft 365 ever since. If you’re still running Rackspace Hosted Exchange today, or you’re on a legacy plan that’s been folded into a transition path, this is the context behind it.

Apps4Rent has helped many organizations make this exact move. As a Tier-1 Microsoft Cloud Solution Provider, we verify your current Rackspace plan, confirm the equivalent Microsoft 365 license, and migrate every mailbox at no charge when you purchase Microsoft 365 through us.

Sources: Rackspace incident disclosures via its status page; reporting from SecurityWeek (“Rackspace Shuts Down Hosted Exchange Systems Due to Security Incident,” Dec 2022) and Dark Reading (“Rackspace Sunsets Email Service Downed in Ransomware Attack,” Dec 2023).

Why Migrate from Rackspace to Office 365?

Many businesses find that as their communication needs grow, Rackspace Email alone no longer provides the flexibility or integration they require. Choosing to migrate from Rackspace to Office 365 allows organizations to move from a standalone mail service to a complete productivity suite. With Outlook, Teams, SharePoint, and OneDrive working together, employees can collaborate in real time, share files securely, and manage projects without switching between different platforms.

Security considerations also play a significant role in the decision to migrate email from Rackspace to Office 365. Microsoft 365 comes with built-in threat protection, multi-factor authentication, and encryption, all designed to safeguard sensitive information. For industries with strict compliance requirements, such as healthcare, legal, and financial services, the platform’s certifications and built-in compliance tools make regulatory alignment significantly easier to achieve than bolting compliance tools onto a standalone email host.

Scalability and accessibility further highlight the advantages of a Rackspace to Office 365 migration. Businesses can add users or expand operations without investing in new infrastructure, while employees gain the freedom to work from any device, anywhere. Reliability matters too. Microsoft’s global data centers, backed by enterprise service-level agreements, help ensure consistent uptime and minimize disruptions compared to smaller, regional hosting providers.

Finally, cost efficiency often tips the balance for companies evaluating a Rackspace migration to Office 365. Consolidating email, collaboration, and productivity services into one subscription simplifies IT administration and reduces overhead. With regular updates and new features included at no extra charge, businesses benefit from ongoing innovation without unexpected costs down the line.

For organizations considering how to migrate from Rackspace to Office 365, the move is less about leaving Rackspace behind and more about adopting a secure, scalable, integrated platform built for how teams actually work today.

Rackspace vs Microsoft 365: Feature Comparison

Rackspace Email and Microsoft 365 overlap only in core email functionality. Across every other dimension, including collaboration, security, storage, and applications, Microsoft 365 offers capabilities that Rackspace simply doesn’t provide. The table below breaks down the comparison across Rackspace’s two main email products and two common Microsoft 365 business plans.

Pricing reflects published Microsoft rates and approximate Rackspace market pricing as of publication. Rackspace pricing may vary by contract and legacy plan. Apps4Rent customers receive free migration with all Microsoft 365 plans.

Not sure which Microsoft 365 plan replaces your current Rackspace setup? Compare Microsoft 365 plans →

Migration Methods: IMAP, Hosted Exchange, or Hybrid?

The right migration approach depends entirely on which Rackspace product you’re currently using. Choosing the wrong method is the single most common cause of incomplete or failed migrations, and the main reason organizations turn to a migration specialist rather than attempting it in-house.

How to identify your Rackspace environment: log into your Rackspace Control Panel. If you see “Rackspace Email” under your hosting, your mailboxes use IMAP/POP3. If you see “Microsoft Exchange” or “Hosted Exchange,” the migration requires an Exchange-compatible approach. If you have both, you’re on a hybrid setup and the migration is more involved. See our dedicated Rackspace Hybrid to Office 365 migration guide.

Apps4Rent handles all three migration types at no additional cost. When you purchase Microsoft 365 through Apps4Rent, our engineers assess your Rackspace environment, select the correct migration method, and execute the full migration, including distribution lists, shared mailboxes, contacts, and DNS changes. You don’t need to figure out the method yourself.

Benefits of Migrating from Rackspace to Office 365

Migrating from Rackspace to Microsoft 365 isn’t simply an email move. It’s a platform upgrade that changes how your team communicates, collaborates, and secures its data. Here’s a closer look at what organizations consistently report after making the switch.

• Advanced Features and Functionality

  Office 365 offers a diverse range of tools such as Exchange Online, SharePoint Online, and Microsoft Teams, designed to optimize communication, encourage seamless collaboration, and streamline document management, all working together rather than as isolated tools.

• Real-Time Collaboration, Not Just Email

  Microsoft Teams, included in all business Microsoft 365 plans, replaces the need for separate video conferencing and chat tools. SharePoint and OneDrive enable real-time document co-authoring that standalone email hosting like Rackspace simply doesn’t offer.

• Enterprise-Grade Security Built In

  Microsoft Defender for Office 365 protects against advanced phishing, malware, and zero-day attacks. Multi-factor authentication, Conditional Access, and Microsoft Secure Score provide a security posture that would cost significantly more to replicate on top of a standalone email service.

• Compliance Certifications Out of the Box

  Microsoft 365 carries FedRAMP, HIPAA BAA, SOC 1/SOC 2, ISO 27001, GDPR, and 90+ additional compliance certifications. Healthcare, legal, and government organizations can meet regulatory requirements without building separate compliance infrastructure.

• Scalability Without Infrastructure Investment

  Adding a new employee requires purchasing one license, with no server provisioning and no storage upgrades. Apps4Rent offers both annual and monthly Microsoft 365 licensing so your plan scales with your business, up or down.

• Access Anywhere, on Any Device

  Outlook, Teams, SharePoint, and OneDrive are accessible from any browser or native app on Windows, Mac, iOS, and Android, with offline mode in Outlook and Office apps for uninterrupted work, a capability Rackspace Email doesn’t match.

• Lower Total Cost of Ownership

  Microsoft 365 Business Basic at $7/user/month includes Exchange Online, Teams, SharePoint, and OneDrive, capabilities that would cost $20 to $40 per user per month through separate vendors. Apps4Rent’s free migration removes the remaining cost barrier to switching.

  

  Figure 2: Six key benefits of migrating from Rackspace to Microsoft 365. Apps4Rent
  [Dev note: replace with a refreshed 2026 version of this graphic. Current asset dates to 2019]

Prerequisites Before Starting Rackspace to Office 365 Migration

A successful Rackspace to Office 365 migration starts well before the first mailbox moves. Complete each item below before beginning. Organizations that skip prerequisites account for the majority of delayed or failed migrations.

Access and permissions:

• Admin access to the Rackspace Control Panel, needed to create the migration admin account and retrieve server details.
• Global administrator access to your Microsoft 365 tenant, required to create migration endpoints and assign licenses.
• “Full Access” permissions granted to the migration admin account across every Rackspace mailbox.

Data inventory:

• Complete mailbox inventory: user mailboxes, shared mailboxes, resource mailboxes, and aliases.
• Distribution lists, noting which are hidden and require unhiding before migration.
• Contacts, calendars, and public folders, which require separate handling from standard email data.
• Total data size estimate, which determines your migration timeline and batch sizing.

DNS and infrastructure:

• Current MX, SPF, DKIM, and DMARC records documented, since you’ll update all of these at cutover.
• Rackspace server hostname (found in Control Panel), required to create the migration endpoint.
• Network bandwidth assessment, planning for at least 10 Mbps of available bandwidth per 100 concurrent mailboxes.

Planning:

• Microsoft 365 plan selected and purchased. See the plan comparison to identify the right tier for your team.
• Migration window scheduled, planning DNS cutover outside business hours (late evening or weekend).
• Users notified at least 5 business days before cutover, including any expected downtime.

By completing these steps in advance, businesses create the foundation for a seamless process when they migrate Rackspace email to Office 365.

Steps to Migrate Rackspace Email to Office 365

The following steps apply to the most common Rackspace migration scenario: Rackspace IMAP or Rackspace Hosted Exchange to Microsoft 365 Exchange Online. If you’re on a Rackspace Hybrid environment, see our dedicated Hybrid migration guide for the phased approach that setup requires.

1. Create a Dedicated Migration Admin Account on Rackspace

   In the Rackspace Control Panel, create a new email account with a recognizable name (for example, migration-admin@yourdomain.com). Grant this account “Full Access” to every mailbox that needs to be migrated. This admin account is what the Microsoft 365 migration tool uses to read your Rackspace mailbox data. Without Full Access on every mailbox, those mailboxes will fail during migration.

2. Unhide All Mail Objects

   Distribution lists, contacts, and resource mailboxes in Rackspace are sometimes hidden from the Global Address List. Before starting, unhide any objects that need to move to Microsoft 365. Note distribution list membership, managers, and email addresses. You’ll need to recreate these in Microsoft 365 after migration, since distribution lists don’t migrate automatically.

3. Retrieve Your Rackspace Server Hostname

   In the Rackspace Control Panel under Settings, locate the incoming mail server address. For Rackspace IMAP accounts, this is typically secure.emailsrvr.com. For Rackspace Hosted Exchange, it’s a unique Exchange server address. Copy this exactly, since you’ll enter it when creating the migration endpoint in Microsoft 365.

4. Select Your Microsoft 365 Plan

   The plan you choose should depend on the applications your team needs, not just headcount. If you’re a small business, Microsoft 365 Business Basic or Business Premium often makes the most sense. Larger organizations may need Office 365 Enterprise E3 or Office 365 Enterprise E5 for advanced compliance and analytics features. See our full Office 365 plan comparison for a side-by-side breakdown.

5. Add and Verify Your Business Domain

   Add your domain in the Microsoft 365 Admin Center under Settings > Domains, and complete the TXT record verification. Do NOT update your MX records at this stage. This step only verifies domain ownership. Updating MX records too early will divert incoming email before mailboxes are fully migrated.

6. Start Rackspace to Office 365 Migration

   The actual migration begins once the two environments are synced. Create a Migration Endpoint in the Microsoft 365 Admin Center (or via PowerShell for larger environments), using the Rackspace server hostname from Step 3 and your migration admin credentials from Step 1. Test the connection before proceeding. A successful test confirms Microsoft 365 can read your Rackspace mailboxes.

7. Run a Pilot Migration First

   Before migrating everyone, migrate 5 to 10 mailboxes as a pilot, mixing small and large mailboxes, including a power user. Verify emails, contacts, calendar events, folder structure, and send/receive functionality all work correctly in Microsoft 365 before proceeding. This is the step most self-managed migrations skip, and it’s the one that catches configuration issues while they’re still cheap to fix.

8. Run Migration Batches

   You don’t want to overload your servers, so migrate the remaining mailboxes in batches of 50 to 200, depending on size and available bandwidth. For larger datasets, this typically uses the same cutover migration method referenced elsewhere on this site. Timing can range from a few hours to several days depending on data volume. Monitor batch status in the Exchange Admin Center, and let each batch reach “Synced” before moving to the next.

9. Enable Users, Assign Licenses, and Validate Access

   Once a mailbox shows “Synced,” assign the user’s Microsoft 365 license and have them log in to confirm access to email, calendar, and contacts. Reset passwords where needed. Have users reconfigure Outlook or their mobile mail app with new Microsoft 365 credentials, and resolve any access issues before cutover.

10. DNS Cutover: Update MX, SPF, DKIM, and DMARC

    Schedule cutover outside business hours. Update MX records to point to Microsoft 365, update your SPF record to include Microsoft’s sending infrastructure, configure DKIM signing, and set an initial DMARC policy to begin monitoring. Allow 24 to 48 hours for DNS propagation, then run one final sync to capture any emails delivered to Rackspace during that window.

11. Decommission Rackspace

    Keep Rackspace accounts active for 30 days after cutover as a safety net. After that hold period, delete the migration batches, disable the Rackspace accounts, and cancel the Rackspace subscription, after exporting or archiving anything that wasn’t part of the migration scope.

Avail free migration assistance for moving Rackspace email to Office 365. Get in touch →

Case Study: 131-Mailbox Equipment Supplier Migration

Rather than a hypothetical example, here’s a real Apps4Rent engagement that shows what this migration looks like in practice.

The organization: An equipment supplier based in Andrews, Texas, running 131 mailboxes on Rackspace’s servers. Rackspace’s pricing had become too expensive for their needs, and they were looking for a lower-cost alternative that could still handle their IT requirements without compromise.

When the company contacted Apps4Rent, our team recommended a move to Office 365. On our advice, they purchased 70 Business Essentials licenses and 40 Business Premium licenses (the modern equivalents of these plans are Microsoft 365 Business Basic and Business Premium), sized to match how different teams within the company actually used email and collaboration tools. A smaller group of users on Exchange Online Plan 1 required separate handling and were migrated on their own track.

Apps4Rent presented a complete migration strategy up front, laying out both cutover migration and PST import as viable options, along with the tradeoffs of each so the customer could make an informed decision. The team ultimately used cutover migration to move all 131 mailboxes from Rackspace’s servers directly into the new Office 365 tenant.

The result: IT costs were reduced by almost half after the migration from Rackspace to Office 365 was complete, while the organization gained the full Microsoft 365 collaboration stack it didn’t have on Rackspace.

Source: Apps4Rent case study, “Migration from Rackspace to Office 365,” available at apps4rent.com.

Common Issues During Migration and How to Fix Them

Even well-planned migrations run into friction. Below are the most common issues organized by when they typically appear: before migration, during batch processing, and at cutover, with specific fixes for each.

Before migration (configuration errors):

• Missing Full Access permissions: Migration endpoint tests fail, or specific mailboxes don’t migrate. Fix: verify the migration admin account has Full Access to every mailbox. A common miss is mailboxes added after the initial permission grant.
• Hidden distribution lists not captured: Lists missing from Microsoft 365 after migration. Fix: unhide all distribution lists in Rackspace before starting, and check Global Address List visibility for each.
• Incorrect Rackspace server hostname: Migration endpoint creation fails with a connection error. Fix: retrieve the exact hostname from Rackspace Control Panel > Settings. Don’t guess, since it differs between Rackspace product types.

During migration (mid-batch failures):

• Slow migration speeds: Batches taking far longer than expected, migration speed under 1 GB/hour. Fix: increase concurrent mailbox migration count (up to 50 concurrent connections for large environments), and schedule large migrations during off-peak hours.
• Incomplete mailbox migration: Emails or folders missing after a batch shows “Synced.” Fix: run a delta sync, starting a new batch for the affected mailboxes to pick up items added after the initial sync.
• Duplicate emails: Users see duplicate messages after migration. Fix: review batch configurations to ensure each mailbox appears in only one active batch at a time.
• “Mailbox full” errors: Duplicates or large data volumes push accounts beyond storage quotas. Fix: clear unnecessary items or upgrade mailbox storage before re-running the batch.

At cutover (DNS issues):

• Emails still routing to Rackspace after MX update: New mail arrives at Rackspace hours after DNS changes. Fix: this is expected. DNS propagation takes 24 to 48 hours. Run a final re-sync once propagation completes.
• SPF failures causing outbound mail to land in spam: Fix: update your SPF record to include include:spf.protection.outlook.com, and remove the old Rackspace SPF entry once routing is fully on Microsoft 365.
• DKIM not configured: Authentication failures, increased spam scoring. Fix: in the Microsoft 365 Admin Center, go to Email Authentication, enable DKIM signing, and add the two CNAME records provided to your DNS.
• General troubleshooting: validate CSV formatting for bulk imports, use clear and unique batch names, and confirm every credential and server endpoint is accurate. Automated migration tools also reduce manual error and improve reliability throughout.

Rackspace to Microsoft 365 Migration Checklist

Use this checklist to track your migration from start to finish. Apps4Rent customers can have our engineers manage every item on your behalf. The checklist below reflects exactly what we work through during a fully managed migration.

• ☐ Identify Rackspace environment type (IMAP, Hosted Exchange, or Hybrid)
• ☐ Inventory all mailboxes: count, sizes, aliases, and shared accounts
• ☐ Document distribution lists, contacts, resources, and public folders
• ☐ Review current DNS records (MX, SPF, DKIM, DMARC)
• ☐ Verify admin access to the Rackspace Control Panel
• ☐ Check network bandwidth: target at least 10 Mbps per 100 mailboxes

• ☐ Create Microsoft 365 tenant
• ☐ Add and verify domain
• ☐ Create user accounts (or sync from Active Directory)
• ☐ Assign appropriate licenses
• ☐ Configure MFA and security defaults
• ☐ Create migration endpoint connecting Rackspace to Microsoft 365

• ☐ Run pilot migration (5 to 10 mailboxes)
• ☐ Validate pilot: emails, calendar, contacts, folder structure
• ☐ Migrate remaining mailboxes in batches
• ☐ Monitor migration status in the Exchange Admin Center
• ☐ Re-sync to capture new items received during migration
• ☐ Validate mail flow before DNS cutover

• ☐ Update MX records to point to Microsoft 365
• ☐ Update SPF record to include Microsoft 365
• ☐ Configure DKIM signing
• ☐ Implement DMARC policy
• ☐ Test inbound and outbound email
• ☐ Reconfigure Outlook profiles and mobile devices
• ☐ Remove Rackspace migration batches
• ☐ Decommission Rackspace after 30-day hold period

Want a PDF version of this checklist? Contact Apps4Rent, and we’ll send it over and assign you a dedicated migration engineer, free with any Microsoft 365 purchase.

Rackspace to Office 365 Migration Cost Considerations

The total cost of a Rackspace to Microsoft 365 migration has two components: the Microsoft 365 licensing cost, and the migration service cost. For Apps4Rent customers, the migration service cost is zero. It’s included with every Microsoft 365 subscription purchased through us.

The hidden cost most organizations miss: staff time. A self-managed Rackspace migration for a 50-user organization typically requires 20 to 40 hours of IT staff time spread over 2 to 3 weeks, time that could go toward other projects. At $75 to $150 per hour for internal or contracted IT time, that adds $1,500 to $6,000 to a migration Apps4Rent handles for free.

What Rackspace charges: Rackspace does not provide migration assistance to help customers move off its platform. If you ask Rackspace support for help migrating to Microsoft 365, they’ll typically point you to third-party migration providers, who charge per mailbox. Apps4Rent’s zero-migration-fee model works because we earn on Microsoft 365 licensing, not on the migration service itself, so there’s no incentive to upsell migration support.

Post-Migration Best Practices

A successful mailbox migration isn’t the finish line. It’s the starting gate. The following steps, completed in the first 30 days after cutover, determine whether your Microsoft 365 environment performs at its full potential.

• Verify Data Integrity: First 48 Hours

  Have 5 to 10 representative users confirm their full email history, calendar events, and contacts are present and accurate. Specifically check the oldest emails in each folder, recurring calendar events, contact details, and subfolder contents. Report discrepancies immediately. Batches can typically be re-synced within the first 7 days if needed.

• Validate Mail Flow: First 72 Hours

  Send test emails from Microsoft 365 to external recipients and confirm delivery, then have external senders email your domain to confirm receipt. Check spam filtering. Some legitimate senders may need whitelisting in the first week while Microsoft’s filters calibrate to your domain’s typical sending patterns.

• Reconfigure Outlook and Mobile Clients

  Most modern Outlook clients detect new Microsoft 365 settings automatically via Autodiscover and prompt for new credentials. Older versions (Outlook 2016 and earlier) may require manual profile recreation. Have IT or Apps4Rent support available on cutover day to help users reconfigure mobile mail apps.

• Configure Security Baselines

  Enable multi-factor authentication for all users, the single most effective security step available, and one that takes roughly 30 minutes to configure organization-wide. Review Microsoft Secure Score recommendations, configure Conditional Access policies if your plan includes them, and set up alerts for suspicious sign-in activity.

• Prioritize User Adoption

  The leading cause of underwhelming Microsoft 365 rollouts isn’t technical. It’s user adoption. Employees coming from Rackspace Email have likely never used Teams, SharePoint, or OneDrive. A brief 15 to 30 minute onboarding session in week one, plus a short quick-reference guide, goes a long way. Apps4Rent provides user adoption resources for all customers as part of the migration package.

Migrating Rackspace to Office 365: Is it a Good Idea?

The Rackspace to Office 365 migration process can be summarized in four sentences: create an admin account, choose your Office 365 plan, purchase licenses for your users, and sync the accounts. But the details matter. Aliases, alternate addresses, distribution lists, public folders, and similar objects are genuinely difficult to migrate correctly without prior experience, and that’s before accounting for compatibility issues, unexpected outages, or DNS misconfigurations that can be hard to troubleshoot mid-migration.

This is exactly why it’s worth using an authorized Office 365 migration service provider rather than attempting it entirely in-house. Experienced Microsoft consultants and certified CSPs bring the tooling, process discipline, and pattern recognition that comes from having done this hundreds of times, from assessing infrastructure readiness through post-migration support.

Apps4Rent is one such Microsoft-certified service provider. We’ve completed Rackspace to Microsoft 365 migrations for organizations across 90+ countries, with engineers available 24/7/365 via phone, email, and chat. If you’re weighing whether to migrate from Rackspace to Office 365, we’d be glad to walk through your specific environment and give you a straight answer on timeline and approach. Call us now.

Also Read: How to Migrate POP3 Email to Office 365, Complete Guide

Migrating from Rackspace to Office 365 is a strategic move toward a secure, scalable, integrated productivity platform built for how modern teams actually work. The process can involve real complexity, including data validation, DNS updates, and user training, but the long-term advantages of Microsoft 365 consistently outweigh the short-term friction. Organizations that complete a well-planned Rackspace to Office 365 migration position themselves for greater agility, stronger security, and lower ongoing costs.

Choosing the right partner is critical to a smooth transition. As a Microsoft Solutions Partner, Apps4Rent offers a full range of Microsoft 365 plans and includes free migration support for every customer who purchases licenses through us. Whether you’re still exploring how to migrate email from Rackspace to Office 365 or you’re ready to start the process today, our team is here to make the journey smooth, secure, and cost-effective, with 24/7 support via phone, chat, and email at every step.

Frequently Asked Questions on Rackspace to Office 365 Migration

1. How do I migrate from Rackspace to Office 365 step by step?

   To migrate from Rackspace to Office 365: create a migration admin account in Rackspace with Full Access to all mailboxes; unhide distribution lists, contacts, and resources; retrieve your Rackspace server hostname from the Control Panel; purchase the right Microsoft 365 plan; add and verify your domain in the Microsoft 365 Admin Center without updating MX yet; create a migration endpoint connecting Rackspace to Microsoft 365; run a pilot migration with 5 to 10 mailboxes; migrate the remaining mailboxes in batches; validate user access; update MX, SPF, DKIM, and DMARC records at cutover; and run a final re-sync before decommissioning Rackspace after 30 days.

2. How do I export my Rackspace mailbox?

   Log into your Rackspace Control Panel, navigate to the user account, and use the Archive and Export tool to download mailbox contents in PST or EML format. For a full Microsoft 365 migration, manual export usually isn’t necessary. Apps4Rent migrates mailbox data directly using the Microsoft 365 migration tools, without requiring a manual export step.

3. How much does it cost to migrate from Rackspace to Microsoft 365?

   The Microsoft 365 license cost ranges from $7/user/month (Business Basic) to $57/user/month (E5), billed annually. The migration service itself costs $0 when you purchase Microsoft 365 through Apps4Rent, included at no additional charge. Self-managed migrations or third-party migration tools typically cost $15 to $50 per mailbox. For a 50-user organization, Apps4Rent saves $750 to $2,500 in migration fees compared to industry standard rates.

4. What migration tool does Apps4Rent use for Rackspace to Microsoft 365?

   Apps4Rent primarily uses Microsoft’s native migration tools built into the Microsoft 365 Admin Center: the Migration Wizard for IMAP migrations and Exchange-compatible migration for Rackspace Hosted Exchange. For complex environments with large mailboxes or hybrid configurations, our engineers may supplement with PowerShell scripts. We do not use third-party migration tools that require separate licensing or introduce additional security risks.

5. Do users need to recreate their Outlook profiles after migration?

   In most cases, Outlook 2019, Outlook 2021, and Microsoft 365 Apps for enterprise automatically detect the new Microsoft 365 settings via Autodiscover and prompt users to re-enter their credentials. No manual profile recreation is required. Older Outlook versions (2016 and earlier) may require manual profile recreation. Mobile apps require users to add their account with Microsoft 365 credentials. The old Rackspace account settings will not work after cutover.

6. Is there downtime during the Rackspace to Office 365 migration?

   No, there is no email downtime during the migration itself. Users continue using Rackspace Email while mailboxes are synced to Microsoft 365. The only brief disruption occurs at DNS cutover, when MX records are updated to route new incoming email to Microsoft 365. This transition typically takes 15 to 60 minutes and is scheduled outside business hours. Emails sent to your domain during DNS propagation (24 to 48 hours) may arrive in Rackspace. Apps4Rent runs a final re-sync to capture any missed items.

7. Does Rackspace update DNS records automatically when I migrate?

   No. Rackspace does not update DNS records on your behalf during a migration to Microsoft 365. You must manually update MX records, SPF records, and DKIM configuration through your DNS provider, the registrar where your domain is hosted (GoDaddy, Namecheap, Cloudflare, and similar). Apps4Rent engineers provide the exact DNS values for your Microsoft 365 tenant and guide you through the update process, or can update records directly if you grant DNS access.

8. How long does a Rackspace to Microsoft 365 migration take?

   Migration timeline depends on the number of mailboxes and total data size. Small organizations (under 25 mailboxes, under 50 GB total) typically complete migration in 24 to 48 hours. Mid-size organizations (25 to 100 mailboxes, 50 to 500 GB) typically take 3 to 7 days. Large environments (100+ mailboxes or over 500 GB) may require 7 to 21 days for the full migration, with batching and throttling management. The DNS cutover itself takes under an hour. Apps4Rent provides a specific timeline estimate after reviewing your Rackspace environment.

9. Can I migrate Rackspace distribution lists and shared mailboxes?

   Yes, but they require separate handling from user mailboxes. Distribution lists are not migrated by the Microsoft 365 migration tool. They must be recreated manually in Microsoft 365 with the correct membership and managers. Shared mailboxes must be migrated using service accounts with Full Access permissions. Apps4Rent’s migration process includes a complete object inventory before migration begins, so no distribution list, shared mailbox, or resource mailbox is missed.

10. Is it possible to migrate from Rackspace to Microsoft 365 without losing email?

    Yes. A correctly executed Rackspace to Microsoft 365 migration transfers all email, calendar events, contacts, and folder structures with zero data loss. Apps4Rent has a zero-data-loss record across 10,000+ migrations since 2003. The key risk of data loss in any migration is premature cutover, switching DNS before mailboxes are fully synced. Apps4Rent confirms complete sync before any DNS changes are made.

11. What happens to my Rackspace email if I cancel before migration is complete?

    Do not cancel your Rackspace subscription until migration is complete and DNS has been cutover to Microsoft 365. If Rackspace access is cancelled early, the migration tool can no longer read your mailboxes. Keep Rackspace active through the full migration, including at least 30 days post-cutover as a safety hold period. Apps4Rent coordinates the Rackspace cancellation timing as part of the managed migration service.

12. Can Apps4Rent migrate Rackspace Hybrid Exchange environments?

    Yes. Rackspace Hybrid environments, where some mailboxes are on Rackspace Hosted Exchange and others are on standard Rackspace Email, require a phased migration approach. Exchange mailboxes and IMAP mailboxes use different migration methods and cannot be combined into a single batch. Apps4Rent’s engineers identify and separate hybrid mailbox types during the assessment phase, then manage each type through the appropriate migration path.

13. Does Apps4Rent migrate contacts, calendars, and tasks, or just email?

    Apps4Rent migrates email messages, calendar events (including recurring events), contacts, and task items where the source platform supports it. Rackspace IMAP accounts support email and contacts migration. Rackspace Hosted Exchange supports full migration of email, calendar, contacts, tasks, and notes. Public folders and shared calendars require additional configuration. Our migration scope is confirmed during the pre-migration assessment call.

14. Why use Apps4Rent for Rackspace migration instead of doing it myself?

    You can perform a Rackspace to Microsoft 365 migration without external help if you have an IT administrator comfortable with Exchange migration tools, DNS management, and the Microsoft 365 Admin Center. The Microsoft documentation is available at Microsoft Learn. The reasons most organizations choose Apps4Rent: the migration is free (self-managed migrations typically cost $15 to $50 per mailbox for tools and third-party services), our engineers have completed this specific migration hundreds of times and can resolve issues in hours rather than days, and the risk of data loss or extended downtime from configuration errors is significantly higher in self-managed migrations. The decision is straightforward. Apps4Rent costs the same as buying directly from Microsoft, but includes expert migration management at no additional charge.

Apps4Rent – Tier 1 Office 365 Cloud Solution Provider

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