Outlook email not syncing

Step by step

1. Check webmail first (outlook.com, Gmail, or your provider's site). If mail is there, the problem is the app.
2. Make sure Outlook isn't in Offline mode: classic Outlook, Send/Receive tab › Work Offline should be off.
3. Restart Outlook and the computer.
4. Check for a stuck large email in the Outbox. Move it to Drafts, remove the large attachment, and resend.
5. Update Office: File › Office Account › Update Options › Update Now. The new Outlook updates with Windows.
6. If you recently changed your email password, update it in the app, or remove and re-add the account.
7. Classic Outlook: run Microsoft's Support and Recovery Assistant (or Get Help app) for Outlook connection problems.
8. If it's a Gmail or other account, check that IMAP is enabled in that provider's settings.