AT&T Tilt 2 and the HTC HD2
a) The strength is Windows Phone 6.5.x - there are so many quality apps available, most for free or very inexpensive. Its a proven platform that is improving with the times.
b) I really enjoy my Windows Phone device. When I get "bored" with the way it looks, I usually switch back & forth from Microsoft Titanium interface to HTC Sense 2.1 interface.
c) I see them moving from a Business paradigm into the Consumer market.
d) I can run and/or emulate any Blackberry App, so don't worry about losing anything. Look at the gain in more apps, true multi-tasking and simple interface with Microsoft Exchange, no extra BES Server required!
e) Microsoft Marketplace has lots of great apps & games, so does OpnMarket, which has over 10,000 free & quality apps. Then, there's many other app stores, providers and developers who have been developing and perfecting there apps for many years.
Daily Integration:
Access 9 different e-mail accounts, 1 Exchange, 2 IMAP and 6 POP accounts.
Access Google Voice - Originate & receive calls, see & hear voicemails
GPS-enabled apps - weather, maps, Geocaching, etc.
Barcode scanners - instantly compare prices online when out shopping. Just scan the barcode and it looks up the prices online.
Finding the best gas prices in my geographic are via GPS.
Texting.
Twitter & Facebook.
OpenVPN to access corporate network to support PCs and Servers via VNC, Remote Desktop and Putty.
And there's the occasional games to break the day's tensions!