Here's a very cool way to use our new VS Online extensibility (that will be available in TFS V.Next) to enable sending an email to a Team Room.  Our new REST, OAuth and Service Hooks support can be used in countless creative ways.

http://blogs.msdn.com/b/slange/archive/2014/08/26/send-email-to-a-team-room-with-vso-service-hooks-and-zapier.aspx

Brian