@James & AC
James - I can honestly say I detest the Iphone, I find it amusing when people show me their new iphones, yes, you paid a lot of money for a phone that took 3 years to be able to copy & paste, comes with (on average) 18 month to 2 year contracts yet is superceded annually, can only run 'authorised' software unless you hack the phone etc etc (I could continue but this is a windows for phones comment page)
AC, I currently use a TyTn II, which replaced a Hermes 100 (Orange SPV M3100) which replaced a HTC Universal (XDA Exec) etc right the way back. My next phone will most likely be a HTC (Though Orange aren't currently listing a WM based HTC phone other than Touch 3G unless you are a business customer)
The point I was trying to make however was that there is a plethora of virii for the standard x86 windows platform, comparatively few for the WM platform, and the worst possible thing I can imagine from MS is the inception of an OS which SHIPS on 4.3Gb of media, has more security holes in it than Paris Hilton has had spam javelins, expands on the drive at a seemingly exponential rate, boots marginally slower than your average 3 yr old can solve integral calculus in their head, and is less stable than your average serial killer.
Especially when that OS is targetted at a platform which is inherently designed for the purpose of placing calls. If the person who came up with the idea of a full windows version on a mobile phone was an animal, they would probably get caught in a trap, chew 3 legs off and still be stuck.
and finally AC.. yes, it's a good job MS stick to making software, they wouldn't make any money in hardware, they would probably name their hardware something silly like Xbox, or Zune or... oh, wait.
The tiering of the OS was due to the way the Vista platform works, the way Windows 7 will work, and the fact that there are 2 versions of Windows Mobile 6, the Pro version (has office and a few other things) and the Standard version.
What's next? Windows for washing machines? "Fatal Error, The drivers for your socks caused an unexpected fault in nose.exe"