outlook on my MAC is not working

Try these checks in order:

1. Verify Outlook is online on the Mac.
   • In Outlook, open the Outlook menu.
   • Make sure Work Offline is not checked.
2. Check whether the Mac is connected to the mail service.
   • In Outlook, go to Tools > Accounts.
   • Look at the Exchange account status indicator. If the indicator is orange, there is a connection problem.
   • If mail works in Outlook on the web, the issue is likely with the app connection rather than the mailbox itself.
3. Confirm the network connection.
   • Open a web browser and verify that websites load.
   • If on a work or school network, a network or server issue may be blocking access.
4. If Outlook on Mac is connected but not syncing, empty the cache for the affected Exchange folder.
   • Warning: this deletes any information in that folder that is not synchronized with the Exchange server, including contacts' mail certificates.
   • In the navigation pane, Ctrl+click or right-click the Exchange folder.
   • Select Properties.
   • On the General tab, choose Empty Cache.
   • Outlook will download the items again from the Exchange server.
5. If the account cannot connect at all, verify account settings.
   • In Tools > Accounts, select the account.
   • Confirm the account credentials and Exchange server details are correct.
   • Outlook for Mac supports Exchange Server 2010 Service Pack 2 or later, or Microsoft 365 for business.
6. If the issue is on iPhone as well, test the mailbox in Outlook on the web.
   • If Outlook on the web also fails, the mail server or account may be unavailable.
   • If Outlook on the web works but both devices do not, the issue is likely device app sync or connection related.
7. For a current known sync issue affecting Outlook for Mac and Outlook Mobile, this workaround is listed:
   • Open the Outlook web app.
   • Go to the People pane.
   • Select Favorites under the mailbox.
   • Delete all Favorites contacts.

• I'm not receiving email or other items in my Exchange account in Outlook for Mac
• I can't connect to my Exchange account in Outlook for Mac
• I can't send or receive messages with Outlook for Mac
• Outlook for Mac and Outlook Mobile intermittently stop syncing