You can search Exchange Online mailboxes. You can search the content of messages, and metadata such as mailbox name, Subject, From, and received time.
Procedure
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From the navigation pane, go to Protect > Office 365.
The Office 365 Overview page appears.
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On the Apps tab, click the app.
The Overview page of the app appears.
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On the Mailboxes tab, select the mailbox, and then click Restore > Restore messages.
The mailbox contents appear.
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In the upper-right area of the page, click the Search box.
Search criteria appear.
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Click Search.