We are running Exchange 2010 and have recently come across this problem:
We originally ran this command:
Get-MailboxDatabase -identity “[mailbox database name]” | Add-ADPermission -user [username] -AccessRights GenericAll
And now when we try to remove the full access permissions from any Mailbox it gives us this error message but actually DOES remove the permissions. So the process does complete even though it gives us this warning message. Has anyone experienced this error before or does anyone know what we can do to get rid of it?