The Treo 750 looks like any of Palm’s other Treo smartphones but two groundbreaking differences lurk under its hand-held hood. The 
first is that it runs Windows Mobile operating system - something you never expected from Palm, which used to be Microsoft’s fiercest competitor in the PDA and smartphone stakes. Palm continues to sell devices powered by the original Palm OS but there’s little doubt it sees more of a future in the Windows world.
Fortunately, Palm enlisted its PDA expertise to enhance the Windows Mobile platform beyond anything else on the market.
Review: Palm Treo 750 - Reviews - Phones & PDAs - Gadgets - Technology