Let the hive mind of Engadget get that for you.
"I just switched to Sprint from Verizon about three months ago for the Pre. Then I went for the Hero about a week ago. Now, I miss my hardware keyboard and am thinking about switching to the Moment. I am still able to switch back to Verizon if I want and get the Droid when it arrives. Should I just trade up to the Moment when it comes out, see if I like it, and if not switch to the Droid? Or something else entirely? Help!"
Not sure that M$ will produce any M$ branded phone.
First they should accept to act as a niche player (like Apple or RIM) but, we know, that's not familiar at Redmond.
my 2 cents about Microsoft strategy, http://meedabyte.wordpress.com/2009/02/10/does_steve_ballmer_have_the_x/
;)