Gal is not updating
In Outlook 2013 and Outlook 2016, you’ll find that this option is no longer available as full details are also used to build the Contact Card.Another way to make sure that you get a fresh copy of the OAB is by renaming the oab-files to when Outlook is closed.
Rather than waiting 24 hours for Outlook to update the Offline Address Book on its own, you can force an update via the Send/Receive menu button.
For me, new colleagues are not showing up and the contact pictures aren’t displaying either.
They do for my colleague sitting next to me, so I don’t think it is a server misconfiguration or something like that.
They are stored in the following location: which itself holds subfolders with named after Account GUIDs.
When you have multiple Exchange accounts configured, you’ll find a folder for each account that you have.