Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
For a work Microsoft 365/Exchange account, use this order:
- Check whether Outlook is offline.
- In Outlook for Mac: on the Outlook menu, make sure Work Offline is not checked.
- In classic Outlook for Windows: if the status bar shows Disconnected, Working Offline, or Trying to connect…, go to Send/Receive > Work Offline to switch back online.
- Check the Exchange account connection.
- In Outlook for Mac, go to Tools > Accounts.
- Select the Exchange account in the left pane.
- If the connection indicator is orange, there is a server connection problem.
- Test the mailbox outside the desktop app.
- Try signing in with Outlook on the web.
- If Outlook on the web also fails, this points to a server-side or account issue and the Microsoft 365 admin or company IT support should investigate.
- Check common mailbox causes.
- Check Junk Email.
- Check the Other tab if Focused Inbox is enabled.
- Check for Inbox rules or forwarding that could be moving messages.
- If Outlook for Mac is connected but not syncing, clear the affected folder cache.
- Caution: emptying the cache deletes any information not synchronized with the Exchange server, including contacts’ mail certificates.
- In the navigation pane, right-click the Exchange folder.
- Select Properties > General > Empty Cache.
- Outlook will download the items again from Exchange.
- If this started suddenly today and web access is also failing, contact the company IT admin.
- For business mail flow issues, the admin can check domain health and run a message trace.
- If needed, the admin should open a Microsoft 365 support ticket.