Service advisories for OAB size limits
This advisory informs you when your Offline Address Book has reached the size limit outlined in the Address Book Limits within the Exchange Online limits.
These advisories are displayed in the Microsoft 365 admin center. To view these advisories, navigate to Health > Service Health > Exchange Online and finally, the Active Issues tab. This advisory will be listed as "Offline Address Book."
What Do These Service Advisories Indicate?
This service advisory informs you that the maximum size of a single Offline Address Book within your tenant has exceeded 1 GB. If you receive this advisory, we ask that you review any recent changes made to the Offline Address Book(s) in your environment. Your users may observe missing or incomplete data if the size issue isn't corrected.
More information
For more information about Offline Address Books, see the following articles:
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