I can handle the server side "tweaks" but don't want to try walking users through anything beyond "just close Outlook and reopen".
Anyway, I didn't know about restarting the Exchange File Distribution Service...
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.
Is there any way I can force a manual update of the Offline Address Book (OAB) in Outlook or reset it completely otherwise?Like the answer in the linked question, I know that the mailbox role needs to get a copy to the client access role, but both of these roles exist on the same server in this instance (there's also only one server at this Exchange org).So, the real question is, how can I manually force updates to get the OAB on the server and the OAB on the client to show a new mailbox immediately (or within an hour) instead of saying to users "they'll show up in the GAL tomorrow"?Please visit the document on How to turn on or off Cached Exchange Mode for (Outlook 2007, Outlook 2010, and Outlook 2013).Outlook 2011 does not use Exchange Cached mode and directly connects to the Global Address Book (GAL) via LDAP connection.New Outlook instances seem to check a few minutes after startup. This is what worked for me when I had terribly-impatient users...I'm curious (and will go sleuthing) if there's a reghack or similar that will force an Outlook client when opened to update the their address book updates every time.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.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.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.