Strange! I do not why it sudden happen. It was working last week.
My machine is installed MOC 2007 to connect to OCS2007. It is connected but appear "Cannot Synchronize Address Book". Further check, only affected to Distribution Group. I search one of Distribution Group, it found then I add in my contact list. It appears on my contact list, but showing "Distribution Group service cannot be performed this action..."
I use my colleague computer and logon to my account. It is perfectly working well. I tried other machine also the same, it is working fine. Except my own machine cannot.
I uninstalled MOC2007, and reinstall it. It is the same.