None. Why? One person I know puts it best: it's from Microsoft, and she hated her HTC Topaz, or whatever that abomination was.
IMO, MS should of NEVER allowed WinMo past v5. 6, 6.1, and 6.5 were horrid for mindshare, as those were waning just as the iPhone launched. Say what you may, the iPhone, IMO, was probably the best catalyst for actual smartphone developement there was to date. A true touch based interface (helped along with a decent software KB and a capacitive screen - remember how many were resistive displays with styluses back then?) that really set the rockets on making smartphones evermore, the main social portal (IMO, of course).
As for the person I'm using as an example, she only remembers Windows was hard to use on phones. Doesn't care about "mobile," "phone," or whatever branding. "Windows," and "Microsoft" were the issues at heart.
Also totally didn't help MS' marketshare in Asia with MS' near nonexistant support for launguages there. Probably propelled MS' previous #1 WinMo supporter, HTC, to become the first Android manuf. Who am I kidding? MS had trouble taking down Palm (even though Palm torpedoed itself already, after the Handspring reaquisition failed to help), and RIM - which iirc, WinMo never surpassed.