


However, this Microsoft update will impact many of your customers who are using Office 365, as well as customers you will be migrating in the months ahead. Microsoft support article - RPC over HTTP d eprecated in Office 365 on October 31, 2017 Once the changes have been rolled out to Office 365 servers, Outlook will not be able to connect unless it has the required updates to support MAPI-over-HTTP. The announcement states that the protocol previously used by Outlook 2007, 2010, and 2013 to connect with Office 365 (RPC over HTTP aka Outlook Anywhere) will no longer be supported by Office 365 after October 31, 2017. The changes will affect all Outlook users who are not using a 2016 version to connect to an Office 365 mailbox.

We want to make sure our partners around the world are aware of this so that you can prepare yourselves and your customers. Microsoft recently announced an upcoming change to their Office 365 (Exchange Online) service that could result in some Outlook users not being able to connect to their mailboxes.
