We have a situation. We have already crossed retention period for mailbox. Is there any way where i can restore mailbox contents? MS has already restored account but unfortunately no data. :(
Unfortunately not, unless you have any 3rd party journaling or archiving solution - but I doubt you do based on your question. Sorry it's not ideal, but that's what it is.
Exchange Online does not have backups. Unless you arrange for third-party backups via Spanning or another provider. Native Data Protection ensures that data is retained for as long as it is needed.
Once data is permanently removed from Exchange Online, it's gone. Permanent is the important word here.
If you need to keep data, don't delete it... Items removed from the Deleted Items folder or via SHIFT/Delete will be permanently removed after the retention period for the mailbox expires.
