2 pretty good phones I would recommend are (considering performance and price):

a. i-mate JAMin/HTC Prophet - Without a slide out keyboard
b. i-mate K-Jam/ HTC Wizard - Essentially the same as the above with a 1.3 MP cam (instead of a 2.0 mp) and a slide out keyboard.

These phones should do the job pretty well for using ms apps (office, email, etc). You could try looking at i-mate's product guide at http://www.imate.com/t-devicedetails.aspx