I was using UMPC to mean a slate-style (touch screen) device with a x86 cpu and 4-10 inch screen. So I would include small convertible tablets with movable keyboards and devices with keypads on their wings, but not a conventional clamshell with a fixed keyboard.
The new category seems to be small no-frills clamshell laptops, with almost all expandability via USB (e.g. no CD or DVD drive) and perhaps even no hard disk. It isn't clear to me whether this is a real category or if it is just defined by price. Clamshell, no touch screen, no DVD, all reduce the cost for example. These may just end up being the low end of the sub-notebook class.
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