Currently Microsoft is working on a server product called Mobile Information Server that will allow this kind of connectivity. To my knowledge there is currently no way to connect directly to exchange server. However if you are using a wireless card you can connect and check your e-mail off of the exchange server. An article on how to do this can be found at -
http://www.microsoft.com/mobile/pock...step/imap4.asp. Good luck with it!
~Spencer