If I recall correctly the Tablet OS option on the Fujitsu P1510 was only $50.

Kevin, I think you should ask the question to Microsoft. Both UX90 and Flybook would be another couple of hundred dollars more expensive with tablet OS, and which manufacturer would want that kind of burden?. I agree that it should be an option nevertheless.

I owned the previous version of the Flybook (A33i), and it is quite a nice device, despite the Crusoe processor which made it pretty slow. I have also owned a Fujitsu P1510D. On both of them, I have installed Tablet PC, and the inking is much better on the Flybook because it has a less sensitive digitizer (cannot remember the grams on both of these off top of my head). It actually worked quite nicely on the Flybook. Of course, the issue with this Flybook model (as was the case with the older model) is $$, they are pretty expensive (much more than Fujitsu).

At the very least, Tablet PC should be an option as an OS on the device, especially since you cannot buy the OS separately. But I must admit that the touchscreen does change some things. I’ve used a P1510D extensively with the Tablet PC OS and I personally believe that so much is lost with a passive digitizer that I sometimes wonder what the value is in having the XP Tablet PC OS on it. The lack of a hover capability on a passive digitizer is a big loss and you wouldn’t think of it until you needed it. In addition, the handwriting has been a nightmare of an experience.

But like I said, it should be an option at the very least.