I have no problems connecting to my work exchange server. I'm using it right now with my work emails and it works fine so far. My exchnage server has a policy set to enable security on the phone and that works also. So I end up having to put a 5 digit secure code on my N9. (wish I can disable this) But yeah, work email works and does push notifications also.

Also, all the answers that you want might be in this thread.
http://talk.maemo.org/showthread.php?t=78480

On the front bottom left underneath the display. It's near impossible to see that it has one when it's not lit up. But it is there. So I hope someone can take advantage of this and make it as useful as how it in on the N900.