Hi, I have a new installation of Exchange 2007 SP2 (CAS+MBX+HUB) with an Edge Exch2007 SP2 both on Windows 2008 SP2. All is running ok, except that Outlook clients get an error when trying to download the Offline Address Book. Searching on TechNet I found that it´s an OAB folder permission issue, then I put "authenticated users" with read permission and clients can work fine (downloading OAB). But when the server is restarted, the permissions are gone. I tried with this command, and after a restart, the permissions are gone again: > $container = "CN=Offline Address Lists,CN=Address Lists Container,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=FAFYFJ-dom,DC=extest,DC=microsoft,DC=com" > add-adpermission $container -user "NT AUTHORITY\Authenticated Users" -ExtendedRights 'ms-Exch-Download-OAB' Thanks in advance for your help. CarlosP

Hi CarlosP, After running the add-adpermission, you can run the 'get-adpermission $container' to make sure that the "'ms-Exch-Download-OAB'" right has been successful added to the Authenticated Users. Have you read the following thread? This thread's owner has a simiallr problem as yours. http://social.technet.microsoft.com/Forums/en/exchangesvrclients/thread/9d92a5c2-a143-46c1-9f68-fe1a766beff6