If you have ever migrated mailboxes on
Exchange 2013, you had surely come across this error when you try to move a
mailbox and move request fails immediately with the error message-
"Cannot
open mailbox /o=Test Lab/ou=Exchange Administrative Group
(FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=MY2013Server/cn=Microsoft
System Attendant"
