The OWA Proxy Enabler allows end users to retrieve messages from any remote location through a Web application for Outlook.
Caution
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If you plan to use Office App to provide your users access to archived messages, you do not need to install the Outlook Web App Proxy Enabler.
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Do not install the OWA Proxy Enabler on Exchange 2013 or later. For more information about using Office App, see Accessing Archived Messages Using Exchange Server 2013 or Later.