Updating gal from outlook
You can't create them with the Outlook or Exchange client.The administrator can grant access permission to one or more users to maintain the DL; such maintenance is done by opening the DL from the Outlook or Exchange Address Book.If you open the DL, you can use the Update button to update the addresses in the DL if the original contact or Global Address List addresses have changed.DLs in Exchange Server mailbox or Public Folders contacts folders are limited to about 128 entries, but those entries can include other DLs.However, you can add only addresses that are already in the GAL.
If you want to hide the contents of the list, put the name of the DL in the the Bcc field (View | Bcc).
Therefore, maintaining a large PDL can be a big chore.
Outlook 98 in Internet Only Mode allows you to create distribution lists called "groups" through the Address Book.
Too often what should be a simple task is made more difficult than it needs to be. can you check client is update with latest version.
3) Are you able to access OAB from EXP powershell by running the command Get-offline Address Book ?