Outlook cached address book not updating

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Now, if you are like most organisations then outlook will be operating in cached mode.

So log in to OWA and test if you can see the new users there.

Quite often all Administrators, even Exchange Administrators simply refer to the users they see in the Address section of Outlook casually as the GAL for ease of reference, but really more often than not, you are looking at the OAB.

However sometimes in large complex organisations we have a situation where a new joiner joins and their colleagues want to email them immediately, but they don’t appear in Outlook for them so they call the Helpdesk “Why isn’t Joe Bloggs in the GAL??

A fairly common (and annoying) problem which seems to like to popup after migrations, yet not unsolvable.

The key issue here is that there are new users added to the directory but they are not showing up 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*.

If you are using Outlook 2003 or 2007 you may be in "Cached Mode", and you are looking at a copy called the "Offline address book" This only gets updated Every 24 hours, and the copy on the server only gets updated every 24 hours at (by default).

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.In addition to this there a a few methods by which your Outlook clients get the offline address book.*Note: Unless you are NOT in cached mode.Outlook 2003 (and older)* clients get their OAB from a public folder, Outlook 2007 (and newer) clients can get their OAB from 'Web-based distribution' (basically form the website on the Exchange (or Exchange CAS) server.When connecting from Outlook for Mac 2011 to a Microsoft Exchange server, Outlook caches the Global Address List for a day.Changes made on the Exchange server, are not directly visible in your Outlook.So there are three factors stopping you seeing that new user on the GAL (, however if that’s not an option, read on).

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