Microsoft is delaying the move to Outlook for Business until 2027, saying the move will “ensure organizations have the time they need to prepare.”

• The New Outlook unsubscription phase postponed from April 2026 to March 2027
• Microsoft wants to “continue to deliver key features and improvements”
• Businesses have also been given “the time they need to prepare” for the change.

Just weeks before the previously set April 2026 deadline, Microsoft announced that it would delay the opt-out phase for businesses to upgrade to the new Outlook by about a year, to March 2027.

The unsubscribe phase will see the new version of the email provider become the default through experience, but businesses may choose to opt out during this temporary phase as they work to roll out the update more effectively.