Exchange Online RPC over HTTP Deprecation(Outlook 2007) October 31 2017

Status: Active

Action Required by: October 31, 2017 at 5:59 PM UTC

Details: On October 31st, 2017, mailboxes in will require connections from for use MAPI over , our new method of connectivity and transport between Outlook for and . In May of 2014, introduced MAPI over HTTP as a replacement for over HTTP. over HTTP was a legacy connection protocol that is being deprecated from . Beginning October 31, 2017, Outlook for Windows clients using RPC over HTTP will be unable to access their mailbox. The necessary action depends on the of Outlook in use in your organization. If you are using or earlier, you need to upgrade. does not contain support for the protocol. We encourage you to to the 365 ProPlus subscription, or access Outlook via the web browser (which is included in your current subscription plan). -2016 customers will need to ensure their version of Outlook for Windows is set up to support MAPI/HTTP. At a minimum, you should ensure you have installed the December update. Lastly, ensure your Outlook clients are not using a registry key to block MAPI/HTTP.

Message Center: MC85988 – Potential service disruption for Outlook for Windows users

Posted: November 16, 2016

Additional Information: KB3201590: RPC over HTTP deprecated in Office 365 on October 31, 2017