The easiest way to do this is simply connect to Outlook Web Access, and query the GAL directly (OWA uses the GAL no the OAB like Outlook running in cached mode does). The User/Mailbox IS listed on the Server But NOT in Outlook.Remember, if you are looking at the Global Address List in Outlook then you are NOT looking at the Servers Global Address List*.I checked the event viewer but there are not errors reported from the OAL generator, in fact according to the events it had rebuilt it successfully.
Please visit the document on How to turn on or off Cached Exchange Mode for (Outlook 2007, Outlook 2010, and Outlook 2013).
I have also enabled the OAL Generator diagnostic logging.
I rebuilt the Default Offline Address List and downloaded the updated address book in outlook however there are still no updates.
Outlook Web Access uses a different model for determining which GAL to display to users than Outlook does.
When changes occur within the main Global Address Book (GAL) on the Exchange server, computers running Outlook 2007, 2010, and 2013 may not automatically receive the updates.