Hey all. I wanted to give you a heads up on an upcoming deprecation in Office 365. On Oct 31, 2017, RPC/HTTP will be deprecated in Exchange Online in favor of MAPI/HTTP, a modern protocol launched in May 2014. Outlook 2007 does not work with MAPI/HTTP. This means that in order to continue email connectivity, Outlook 2007 customers will need to update to a newer version of Outlook or use Outlook on the web.
Additionally, Outlook 2010-2016 customers will need to ensure their version of Outlook for Windows is setup to support MAPI/HTTP. Minimum required versions are: