API Endpoint:
https://outlook.office.com/api/v2.0/
API Description:
The Outlook Extended Properties API allows developers to introduce custom data storage capabilities in apps. The API is useful for integrating a backup interface for accessing stored custom data for Outlook MAPI Properties. The API’s provider recommends that its deployment should be restricted to circumstances requiring access to the custom data for Outlook MAPI properties yet to be included in the Outlook REST API metadata. The API’s data accounts are accessible in Office 365 or Microsoft’s Hotmail.com, Live.com, MSN.com, Outlook.com, and Passport.comaccount domains.
How is this API different ?:
SSL Support:
Yes
API Forum / Message Boards:
API Portal / Home Page:
Twitter URL:
https://twitter.com/OfficeDev
Developer Support URL:
https://msdn.microsoft.com/hh361695
Interactive Console URL:

Authentication Model:
Primary Category:
Secondary Categories:
Popularity:
0
Device Specific:
No
Scope:
Developer Home Page:
Docs Home Page URL:
Supported Response Formats:
Is This an Unofficial API?:
No
Is This a Hypermedia API?:
No
Restricted Access ( Requires Provider Approval ):
No
Terms Of Service URL:
Type:
Supported Request Formats:
Architectural Style:
Version:
2.0
Description File URL (if public):
Is the API Design/Description Non-Proprietary ?:
No
Other(not listed):
0
Other Request Format:
Other(not listed):
0
Other Response Format:
Type of License if Non-Proprietary: