Mimecast has a method to be able to replay emails to OnPremise Exchange which is neat
We had a case needing to do this recently for a customer in 365. Mimecast tout their own product “Sync & Recover” for this however it was a one off thing and the extra cost couldn’t be justified
Thought of a way to do this without this , however you need to export the PST of individual users
- Export Mail to PST of each user missing mail
- Reimport to PST to the office365 in the background for each user ( User the RootFolder in the CSV File as /Inbox
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