I work for a pretty big corporation, and they don't allow true Exchange access on personal mobile devices. Right now, I have my work e-mail pushed to my Tour via BIS. I was able to hop in and configure it as a mail account w/o issue.
I had it running in WinMo for a time as well. Just never played w/ Android much. But it sounds like I should be able to get it pushed. Logging into the browser and viewing it via the OWA website is not a fun experience, so I just want to make sure I can push my mail!
