Use the following information to learn more about the dormant mailbox retention timelines.
|Dormant Mailbox Locked|
If a non-administrative mailbox is not checked for new email messages for more than 120 days, it is considered dormant and will be locked.
|Dormant Mailbox Deleted|
When a dormant mailbox is not checked for new email messages for an additional 60 days after it is locked, the mailbox is deleted. Messages remaining in the mailbox at that time will also be deleted.