Hi,
Do you mean the Exchange offline GAL? Which version of Exchange server are you using? From your
another post in Exchange forum, you are using Exchange online, correct? If this is the case, you may try
this PowerShell script to "tickle" mail recipients in Exchange Online. Or, you have to update the address book from each Outlook client side manually.
Since this issue is more likely related to the Exchange server side, if you would like further assistance on this issue, I'd recommend you post a new question to the following dedicated forum:
https://social.technet.microsoft.com/Forums/exchange/en-US/home?forum=onlineservicesexchange
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Regards,
Steve Fan
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