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MC338988 – Upcoming, Microsoft will be retiring the preview program enabling REST API access to on-premises mailboxes for Hybrid Exchange organizations.
Note: This will impact those who write code against Exchange mailboxes.
Key points
How this will affect your organization:
FAQ:
What API(s) should I use to work with Hybrid Orgs, where some mailboxes are in Exchange Online, and some are on Exchange Server?
Wasn’t EWS going away?
Where can I get help on using Microsoft Graph?
Learn more:
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