You can download archived files from the OneDrive for Business Self-Service Dashboard. You can download only one message at a 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 Self-service dashboard, in the OneDrive for Business section, click Restore.
The file selection page appears.
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From the list, select a file.
In the right pane, a preview of the file appears.
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At the upper-left area of the page, click Download.
A dialog box appears that allows you to save the file.
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Select a location and then save the file.