The following error is found in the MailboxID logs (ESMWorker logs):
MAPI error 8004011D
Error: Microsoft Exchange is not available. Either there are network problems or the Exchange server is down for maintenance.
Component: Microsoft Exchange Information Store
Low level error: 80040115
Context: 00000526
CExchangeSession::Login open default store 8004011d
Statistics for this run
_____________________________________
Folders processed : 0
Messages processed : 0 (0 linked)
Attachments processed : 0
Errors : 1
Warnings : 0
Mailbox export complete.