AWS WorkMail is reaching end of support on 31 March 2027, which means businesses still using the platform now have a clear deadline to take action.
For many organisations, this is more than an email migration. It is an opportunity to move from a standalone mail service to a broader productivity, security and collaboration platform with Microsoft 365 Outlook, Exchange Online, Teams and SharePoint.
The risk of waiting
When a business-critical email platform has a fixed retirement date, delay only increases operational risk. Mailbox migrations need careful planning with evaluation of the current setup, licensing decisions, DNS planning, user communication, testing, migration and support. Leaving this work until the final months can create avoidable pressure, especially as other WorkMail customers may be competing for migration resources at the same time.
Why Microsoft 365 Outlook is the natural destination
Microsoft 365 gives businesses a familiar Outlook experience backed by Exchange Online, but the value goes far beyond email. Users also gain access to shared calendars, Teams meetings and chat, SharePoint document collaboration, OneDrive file access and administration with a mature and secure cloud platform. For SMEs, this turns a forced migration into a practical modernisation project.
Six reasons to migrate from AWS WorkMail to Microsoft 365 Outlook
- Continuity before the deadline: Migrating early helps avoid last-minute disruption and gives the business time to test mail flow, calendars, contacts and user access.
- A better everyday user experience: Outlook is already familiar to many users, reducing training effort and helping people stay productive during the change.
- Broader collaboration: Microsoft 365 connects email with Teams, SharePoint and OneDrive, so the migration can improve how staff communicate, meet and work on documents.
- Stronger security options: Microsoft 365 includes built-in email protection, authentication controls and options such as Defender, Intune, data loss prevention and conditional access depending on the licence chosen.
- A platform for future growth: Once email is in Microsoft 365, businesses can add managed services, backup, retention, device management and Copilot readiness without starting again on another platform.
- Benefit from Microsoft Copilot – with M365 Outlook users have access to Copilot chat which they can use to summarize email threads, search their inbox, draft responses, and help schedule meetings.
What a good AWS WorkMail migration to Microsoft 365 should include
A successful migration starts with a clear assessment. Businesses should look at the current email setup. The migration plan should then cover Microsoft 365 licensing, Exchange Online configuration, security baseline settings, data migration, cutover planning and post-migration support.
At Compete366 we have completed many email migrations and our tried and tested process is as follows:
| Step | Description |
|---|---|
| 1. Discovery | Assess the AWS WorkMail environment, mailbox counts, domains, permissions and migration risks. |
| 2. Microsoft 365 setup | Configure Microsoft 365, Exchange Online, identity, licensing and baseline security settings. |
| 3. Data migration | Copy email, calendars and contacts with minimal user impact. This ensures a low risk as you can fail back to the original mail system. |
| 4. Cutover | Manage DNS changes and mail-flow switch to Microsoft 365. |
| 5. Post-migration support | Validate mail flow, support users and resolve post-cutover issues. |
Turning a forced move into a business upgrade
For many organisations, the immediate reason to act is AWS WorkMail retirement. The bigger opportunity is to use the move to improve resilience, collaboration and security. Rather than simply replacing one mailbox with another, businesses can use Microsoft 365 to simplify communication, standardise identity and access, improve protection against email threats and create a foundation for future productivity improvements.
How Compete366 can help with your AWS WorkMail migration to Microsoft 365
Compete366 helps UK businesses migrate from AWS WorkMail to Microsoft 365 with a structured and proven process covering discovery, Microsoft 365 setup, mailbox migration, DNS cutover and post-migration support.
For SMEs, an initial assessment can provide a practical roadmap, licence recommendation, migration risk review and budget estimate before work begins.
If your organisation still uses AWS WorkMail, now is the time to plan your move. Book a free AWS WorkMail migration assessment and get a clear route to Microsoft 365 Outlook before the March 2027 deadline.
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