Knowledge BaseThis user’s on-premise mailbox hasn’t been migrated to Exchange online. The exchange online mailbox will be available after the migration is completed
Dave asked 4 weeks ago

User’s mailbox on Exchange Online is stuck in limbo:
This user’s on-premise mailbox hasn’t been migrated to Exchange online. The exchange online mailbox will be available after the migration is completed

1 Answers
Andrey Staff answered 4 weeks ago

This issue should be related to the existence of msExchangeMailboxGuid attribute in the on-prem account. 
 
Please clear the following attributes in ADSIEdit:
msExchGuid
msExchRecipientDisplayType:
msExchRecipientTypeDetails:
msExchRemoteRecipientType: