We are running Exchange 2010 on windows 2008 R2. Both Windows and Exchange are fully patched and updated. Our employees are using Outlook 2007 and 2010 in cached mode. Outlook is defaulting to the All Groups instead of the GAL. In addition, after changing some clients to use the GAL manually, they change back to default to the All Goups list. How do I force all clients to use the GAL as the default, instead of the All Groups. Can this be done from Exchange or other central method? Any help would be greatly appreciated.