I get some eventid 9554 and error "Unable to update Mailbox SD in the DS". and then a GUID. I have tracked the GUID back to a user that have been moved to a subdomain, but still have his mailbox on the exchange server that gets the event. I have cheched that the user inherits the permissions from the new domain, but what permissions is missing i cannot find out (what is SD and DS) and is there some specific permissions i chould check.
