Some of my users report that the Address Book in Outlook (2007 and 2010) is now showing the All Rooms address list by default rather than the Global Address List. I´m not sure what might cause this as most of the users dont have this problem. I know how to change it back manually for each user but I would prefer to a) know what caused this to change and b) how to change it back for all users.
So far I´ve not found any way to do this by a group policy or on the Exchange (2010) server. All help greatly appreciated.