If selected, unselect it and check if the synchronization is better now. Go to the Outlook menu and check if the Work Offline option is selected or not. It is the most basic check that you can perform before pursuing any other method. Read Also: What Outlook for Mac Users can do when their Exchange mailbox is full? Fix Exchange synchronization issues in Outlook for Mac

Now, as you know the main reasons behind the issue, we will provide you with some ways to get out of this issue.

Settings: Settings are not accurately configured.

Cache Issue: Your Outlook Cache is corrupted.

Connection Failure: You failed to connect Outlook for Mac with the Exchange Server.

Offline Mode: Your Outlook for Mac is in offline mode.

Many users of Outlook for Mac face this issue, so we need to realize its causes.

Reasons Behind OLM to Exchange Synchronization Issues Due to this, mailboxes are not updated on the server-side or the client-side, and it becomes necessary to fix Outlook for Mac not syncing with the Exchange Server. Sometimes, this Outlook for Mac to Exchange synchronization process gets affected partially or fully due to errors, improper configurations, or OLM file corruption. Synchronization between the Exchange server and client application (Outlook for Mac ) is done so that whenever there is any modification on one side (the Server-side or client-side), the change gets updated on the other side. It facilitates offline working in an Exchange environment. Outlook for Mac provides Exchange connectivity in a Mac environment.

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