Alert Central 1.0 only supports POP3 and IMAP. The first service release will not be adding any other Exchange support. Some other kind of Exchange support is in the pipeline but I cannot say when it will get released.
Go here and vote for the Feature Request asking for more Exchange integration: Alert Central Feature Requests
Hmail is pretty easy to get working on windows, or you could even create a Gmail account and test with that. I'm sorry, we cannot give you an ETA.
Does your MS Exchange server administrator allow WebDAV or EWS access?