office 365-recovering email

We are trying to recover recover emails sent from one email address  to an email address on office 365 .We could not see any email to recover from these recipient. We are still checking it further.

Can you let any steps to be taken regarding what steps to be taken
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Vasil Michev (MVP)Commented:
Were the messages deleted or are just missing? For deletion, there are several layers as detailed in this article:

The usual flow will be to check Deleted items, then the Recover deleted items container, then perform an eDiscovery search. Checking both Outlook and OWA is usually a good idea. It's all detailed in this article:

If they are just missing, do an eDiscovery (described in the second article).

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