Exchange mail search inside db on prem after migration to 365

Question

In a hybrid deployment of exchange 2013 last month I've migrated a mailbox to 365. Now the user says that some mail are missing. I search on 365 with ps command but I don't find the emails. Could I still search the email inside on prem db.

Answer 1

Ok, so unless you have an old backup you can restore to a recovery database, you wont be able to do this

https://learn.microsoft.com/en-us/exchange/high-availability/disaster-recovery/restore-data-using-recovery-dbs?view=exchserver-2019

Answer 2

Possibly.
If its less then 30 days, you can check following this doc to restore it to a different AD account with a mailbox restore request and open it up
https://learn.microsoft.com/en-us/exchange/restore-a-soft-deleted-mailbox-exchange-2013-help