Knowledge Base

Error: [ErrorNonExistentMailbox]


You get the following error in CodeTwo Exchange Migration or CodeTwo Office 365 Migration:

[ErrorNonExistentMailbox] - The SMTP address has no mailbox associated with it.


  • The target mailbox is not fully enabled. A user must log in to the OWA and go through the initial mailbox configuration (define regional settings).
  • You have accidentally pointed at wrong target server.
  • You have deleted or disabled/locked the mailbox on the target server or removed the SMTP address in question from it.
  • Target server domain is improperly configured at your domain registrar (e.g. points at old server).
  • Your source server side DNS forwards target domain queries somewhere else.

See also:

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