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Exchange Server 2010 Defaulting Users to Wrong Address Book

Some time ago, when I added three rooms, Exchange 2010 started defaulting users to the "All Rooms" address book instead of the GAL in their Outlook 2010 client.  I had all of them run a contacts send receive, full details, and they start to default to the GAL again.  This worked for a while, but it seems to have reverted back to All Rooms.  What can I do to stop this?  I want to do it server side, not have all employees have to perform steps.

I vaguely recall some kind of oddity with adding rooms and getting them to appear.   I received advice somewhere, maybe here, to rebuild GAL.  Don't 100% recall the steps, but it was via command line.

Screenshot attached

2 Solutions
Lior KarasentiCommented:
Nick RhodeIT DirectorCommented:
I am not aware of a script or setting in EMC to force all the outlook clients to switch over to the GAL by default and had to advise the users on how to change it or push it 1 by 1.

Set from exchange side:

Outlook Settings for Default Address Book:
JimstigatorAuthor Commented:
Both excellent answers!  I just did the MS KB fix as advised by liorkr.  So far, it looks good.  I did a send/receive full details on address book and it got rid of "All Rooms" out of the top level address books... moved it to a sub of "All address books".  I will run with this and report back.

Thank you!!
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