I have a mailbox on a Exchange Server 2007 SP1. The mailbox works fine, mail is received, user can do everything he needs. The problem is we noticed his free/busy is greyed out when anyone tries to add him to a meeting request.When you are in outlook logged in as the user and look at the permissions tab of his calendar, you get an error "Some permissions cannot be displayed. The client operation failed." If you try and add a delegate to the users mailbox you get "The Delegates settings were not saved correctly. Cannot modify access control list."I went though the Exchange console and Powershell and added my account as a FullAccess user but am not able to open his mailbox. It appears his ACL is corrupted. Is there anyway to reset the ACL and just have it inhereit its permissions and propegate down to all folders such as Calendar, Inbox, etc..?Thanks,Kevin Bull

Hi,You can reset the permissions using pfdavadmin (can be downloadet from Microsoft).I believe that the anonymous permissions are missing (even if set to none it must still be there).Leif