iPhone is not a Mac
but Windows Mobile is pretending to be a PC.
The Psion range were good PDA's but the Windows based PDA's were clueless by comparison. All that CPU power and bright screen and lot's or storage and still they were horrible to use. I could never understand how people could find them useful. I put the SD card from my camera in a top of the range HP PDA and it really struggled to display the pictures. What a useless brick. To top it all they crash and lose all your data on a regular basis.
Apple simply started from scratch with new hardware and a new aproach, not trying to make a desktop operating system fit in your pocket. What Apple have done is really not that amazing, they were just bold enough to do it and tenatious enough to get it done right.
Anyone not in awe of technology can see what's right and what's wrong with PDA's and Mobile Phones. It was obvious that a camera is a good idea and that the view phone is a bad idea.
Look at the graphics on a Windows PDA and that of an iPod Touch or iPhone. The Windows device can hardly keep up with the very basic opening of windows, where as the iPod can scroll and resize as smooth as angel delight making it far easier to get along with. Pretty obvious you should never over burden your hardware with bloated software, but Microsoft have been doing that forever.
Example, P4 with 512 RAM, it runs great with Micro2003, a cut down pirate windows 2003 distro, it's a dream to use. Similar PC with 2GB RAM and Vista, it's just horrible.
MS have choked our computers to death and are now choking themselves.