My environement is as follow: One Exchange 2003 FE One Exchange 2003 Clustrered BE One HUB/CAS - with SP1 + Rollup 2 One Clustered mailbox Server SCC - with SP1 + Rollup 2 I am having som problemes with the "Offline Address Book" The System Public Folders (OAB) is replicating fine, but for some reason the new SCC cannnot update the "Offline Address Book". I have changed the Generation Server I have tured up the diagnostic logging to Export and now when I try to update the "Offline Address List" I get the following events in the Application Log. Event ID: 9109 OALGen encountered an error ffffffff (internal ID 505068d) while generating address list '/o=SSNAME/cn=addrlists/cn=oabs/cn=Default Offline Address List'. Check other logged events to see if this is a serious error. - Default Offline Address List Event ID: 9334 OALGen encountered error ffffffff while initializing the offline address list generation process. No offline address lists have been generated. Please check the event log for more information. - Default Offline Address List I have read this http://www.eggheadcafe.com/software/aspnet/29131559/re-exchange-2007-oab-cre.aspx but I can not find any issues with the permissons. Any help will much appreciated! Regards Jamelia