You can disable the option “Download changes since last Send/Receive” to make sure you get a complete fresh copy of the OAB but this could take longer to download.
Offline address book is used by Office Outlook so that users can locate contact information even when they are not connected to the server.
You can see the list of attributes that will be put into the GAL using When Outlook users are running in cached mode, they rely on the Offline Address Book (OAB) to provide them with access to one or more addresses (that are always available when they are connected directly to Exchange) The OAB is rebuilt and downloaded on a default schedule as shown below.
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.
And additional load from OAB generation and distribution cycles running more frequently may be undesirable to some administrators.
But, assuming you do want to improve this situation in your environment, here is what you can do about it.
If OWA shows the correct details, and cached-mode Outlook does not, then it is likely an OAB-related issue whether that is simply a normal delay as shown above, or possibly an OAB problem of some kind. Well first of all, consider whether you should take any action at all.