When to Sync in Outlook
Why you click sync:
- To get the latest mail: When you're offline or have a poor connection, clicking sync forces a check for new messages.
- To resolve sync delays: If your calendar or contacts aren't updating, a manual sync can kickstart the process.
- To clear cache issues: Syncing can help refresh data when Outlook's local cache gets corrupted or out of date.
Method 1
1. Open Outlook
2. On the keyboard press these three keys simultaneously control + command + K
Method 2
1. Open Outlook
2. Click Sync

Note: - If you are still not receiving emails after a sync clear the outlook cache