This is turning out to be a rediculoius issue. All I want to do is set Receive As access on all Mailboxes (6 in total) using the command line tools and I've wasted about half a day.
The exact commant I am using is:
Add-ADPermission -Identity "D:\Program Files\Microsoft\Exchange Server\Mailbox\First Storage Group\Mailbox Database.edb" -User "PHOENIX\Administrator" -ExtendedRights Receive-As
Can someone please tell me where the error is at Line 1 Char 17, as this is becoming a joke.