You can preview email messages and some attachments that were archived from your Exchange Online mailbox. This operation can help you download, export, or restore the correct messages.
Procedure
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From the navigation pane, go to Protect > Office 365.
The Office 365 Overview page appears.
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Click the user account in the upper-right area, and then go to View > Self-service view.
The Self-service dashboard appears.
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On the Self-service dashboard, in the Exchange Online section, click Restore.
The message selection page appears.
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From the email list, select a message.
In the right pane, a preview of the message appears.
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To view an attachment, in the message preview, beside Attachments, click the link for the file.
A dialog box appears that contains a preview of the attached file.
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To find a specific email, in the upper-left area of the page, in the Search box, enter any keywords that are related to the email, and then press Enter.