Depending on your enterprise-specific requirements, the administrator can configure any of the following:
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Outlook Add-In
Use Outlook Add-In to view and download messages that were archived from your mailboxes.
Outlook Add-In includes the ContentStore Email Viewer plug-in. With the plug-in, you can access messages that have been archived and content indexed.
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Outlook Web App
Use Outlook Web App to retrieve archived messages from any remote location.
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Universal Access
Use Universal Access to access protected messages from any mobile device through Outlook Web App.
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IMAP Client
Use IMAP Client to access messages on mobile devices that support an IMAP client.