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Outlook Extended Properties

The Extended Features API in Outlook enables developers to provide applications specific data storage capabilities. The API is useful for integrating a support interface to access private data saved for Outlook MAPI features. The API provider recommends limiting your application to situations that require access to custom data for Outlook MAPI features that still need to be included in Outlook REST API metadata. API data accounts can be accessed from Office 365 or Microsoft domains from Hotmail.com, Live.com, MSN.com, Outlook.com, and Passport.com.
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