Wow, there is a lot of misinformation on this board..... Surface does connect to Exchange and has since day 1. The problem is that you are using self signed certificates, and surface does not accept self signed certificates unless you install them yourself. This is done for security, it had nothing to do with joining domains or anything like that, there is no bug. Exchange mail has worked on my surface since October 26th. Make sure you install the cert under
"Trusted Root Certification Authorities"
http://blog.brightpointuk.co.uk/adding-exchange-email-account-windows-rt