Microsoft delays enterprise Outlook switchover to 2027, says move will 'ensure organizations have the time they need to prepare'
Summary
Microsoft has delayed the opt-out phase for businesses transitioning to the new Outlook by one year, allowing more time for enhancements to the platform. This decision reflects the company's commitment to delivering an improved user experience.
Key Insights
What is the opt-out phase in the Outlook migration?
The opt-out phase is the second stage of migration where new Outlook for Windows becomes the default experience for users, automatically enabling it, but users and administrators can still revert to classic Outlook if needed.[3][4]
What happens after the opt-out phase, and how long will classic Outlook be supported?
After opt-out comes the cutover stage, where users can no longer switch back to classic Outlook, with at least 12 months' notice; classic Outlook installations will remain supported until at least 2029.[3][4]