By ChenGuichang
Publication Date: 2026-10-03 04:51:00
Quick Answer
If Microsoft 365 email is not syncing on your Mac, first send and receive a test message in Outlook on the web.
If webmail works, check the Mac app’s connection, sign-in, updates and account settings.
For Apple Mail problems starting in October 2026, ask IT to check Exchange Online EWS access before deleting the account.
For Outlook, use the current Mac client and consider Reset Account only after preserving unsynced data.
Use webmail to keep working while you identify whether the problem is local or organization-wide.
