Microsoft: Sync Problem on Outlook for Mac

If you have encountered the sync problem on Outlook for Mac, you might want to clear the cache in your Outlook by following the steps below:
1. Right-click (or control-click) your Exchange Inbox
2. Click Folder Properties
3. Click the General Tab
4. Click Empty Cache

Note: This will clear out any locally cached emails and re-sync your email application with the Exchange server. This process will take several minutes and appears as though nothing is happening. Rest assured, your local cache is being cleared and when the process is complete you will be able to click the OK button.