If the update mechanism appears to be broken for you, it could be because of a corruption in your OAB or in your mail profile.
In that case, you can completely reset it by deleting the files making up the OAB or by recreating your mail profile.
Global address list not updating in cached mode
This situation however is extremely rare since the default maintenance time on Exchange is at AM and updates and downloads are usually performed during working hours.
*** NOTE: The GAL is essentially a real-time / online representation of AD Objects that are Mail Enabled for Microsoft Exchange *** The GAL contains information for all email enabled users, Distribution Groups, and Shared Mailboxes and Exchange Resource Mailboxes.
I might have a problem with my Offline Address Book in Outlook.
For me, new colleagues are not showing up and the contact pictures aren’t displaying either.
The easiest thing to do here is to create a new oab, forge generation, assign it to a mailbox database and force downloading of the oab in an outlook client to verify if that worked. In outlook, click on the down arrow next to Send/receive. Note that if asked, you should select to download the entire address book and not just the changes. In the action pane select the New offline address book 4.