Gal not updating
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If the expected changes aren't present in the GAL, the changes will not replicate to the Offline Address Book.
NOTE: If you change your on-premises Active Directory schema, but the Microsoft Azure Active Directory Sync Tool still doesn't synchronize these changes correctly, go to this Microsoft website to continue troubleshooting this issue: Troubleshoot directory synchronization Manually download the Offline Address Book in Outlook.
Corruption may have occurred if Outlook stopped responding.
For more information about how to create and to set up an email profile in Outlook, refer to the following article: Create a New Outlook Profile NOTE: If the Offline Address Book issue wasn't resolved by using steps 1 through 5, follow this step for validation before you call Microsoft Support.
In Outlook 2010 and previous, it is recommended to leave the option “Full Details” enabled.
After you follow each step, test to see whether the Offline Address Book issue has been resolved.In general, Outlook will automatically update the Offline Address Book (OAB) for Exchange accounts once every 24 hours.