Microsoft Softens Stance but RPC over HTTP is still Dead

Outlook MAPI HTTP

A year ago, Microsoft said RPC over HTTP was dead from Oct 31, 2017 and that Outlook clients must use MAPI over HTTP to connect to Exchange Online. The protocol is still dead, but it will persist in a zombie-like unsupported mode. The question is for how long?

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Outlook Anywhere Gets the Bullet

Outlook MAPI HTTP

Microsoft has announced the demise of RPC over HTTP (“Outlook Anywhere”) connections, which will be blocked for connections to Exchange Online from Outlook desktop clients from October 31, 2017. The year’s notice is intended to allow tenants to upgrade clients to the necessary versions.

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