Default global address list not updating
Address lists and global address lists (GALs) are collections of mail-enabled recipient objects from Active Directory.
For more information, see Address lists in Exchange 2016.
These are the address list and GAL procedures that are covered in this topic: After you create or modify GAL, you need to update its membership. It may take several hours for the GAL to be updated.
If you want to selectively include the recipient in some address lists but not others, you need to adjust the recipient filters in the address lists to include or exclude the recipient.VERBOSE: Update-Global Address List : Previous operation run on domain controller 'western01.domain-name.local'. VERBOSE: Update-Global Address List : Ending processing. Mike mentioned to force AD replication and ensure all DC has correct attribute value configured. Recipient Filter | select Name, Primary Smtp Address, Hidden From Address Lists Enabled $GAL = Get-Global Address List -Identity "Humongous Insurance"; Get-Recipient -Result Size unlimited -Recipient Preview Filter $GAL.Recipient Filter | select Name, Primary Smtp Address, Hidden From Address Lists Enabled | Export-Csv -No Type Information -Path "C:\My Documents\Humongous Insurance Export.csv" For more information about the requirements and implications of having multiple GALs in your organization, see Global address lists.
Please visit the document on How to turn on or off Cached Exchange Mode for (Outlook 2010, and Outlook 20).