Some shoulder-strained road warriors might replace their heavy laptop with a PDA-phone, collapsible keyboard and micro-projector.

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Having email, the Internet, a PDA and your cell phone all rolled up into one tiny device in your pocket that's really manageable has really helped me be more efficient, particularly traveling the world because it all works globally.

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The question is whether you should buy a number of separate trinkets (phone, PDA, pager) and walk around like a digital Christmas tree, or look for a device that combines them all.

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From the beginning of Microsoft's mobile efforts in the PDA era, its touchscreen phone software has had a Start button and windows that could be minimized like the classic Windows desktop.

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