MAPI CDO will not be supported for Exchange 2016
I wanted to point out a significant note for some in the Exchange 2016 Architecture blog post here : http://blogs.technet.com/b/exchange/archive/2015/05/05/exchange-server-2016-architecture.aspx. Specifically, that Exchange 2016 will not support clients using Exchange's MAPI (aka MAPI \ CDO) to access Exchange Data. Exchange's MAPI has been out of main stream support for some time now (as it's tied to the lifecycle of Exchange 2003), so it isn't a surprise that Exchange 2016 will no longer allow it. However, for some ISVs and vendors still relying on MAPI \ CDO this is important note. The time to start planning and developing the next version of your product is now so you are ready when Exchange 2016 ships.