Microsoft has delayed rolling out the new Outlook client to enterprise users by a whole year
Summary
Microsoft has postponed the transition to its new Outlook client for enterprise users from April 2026 to March 2027. This extension allows businesses more time to adapt and enables Microsoft to incorporate user feedback effectively.
Key Insights
What is the 'opt-out phase' for the new Outlook client?
The opt-out phase is the stage where Microsoft begins automatically switching enterprise users to the new Outlook for Windows, requiring administrators to actively opt out if they wish to remain on classic Outlook. This phase was delayed from April 2026 to March 2027 to give organizations more preparation time.[1][2][5]
Sources:
[1]
Will classic Outlook be discontinued soon after this delay?
No, existing installations of classic Outlook through perpetual and subscription licensing will continue to be supported until at least 2029, providing a multi-year transition period beyond the March 2027 opt-out phase start.[1][2]