There are many issues that come up in exchange which are fixed by an undocumented checkbox procedure (see very bottom of post for an examples of issues).  I call this checkbox, The Checkbox of Doom as it is responsible for many failed move-mailbox requests as well as causing mobile devices to stop receiving mail after mailboxes are migrated (iPhone mail shows as connected to server but inbox is empty). 2021 Update: "The Checkbox Polymorph'ed Self" You find yourself in a dungeon and your head hurts. Read more [...]