((Update March 2011: Please check my article regarding compatibility of Service Pack 1 for Windows 7 and Authentec fingerprint driver))
Perhaps you’re already running Windows 7 on your Fujitsu (Siemens) P1610 or P1620 Tablet PC. I for example have succesfully installed the x64-Bit version, but as RAM is limited to 2 GB, I see no value it that and will go back to x86 (32 bit) version these days as I want to reinstall to get a clean system ready for next Beta of Office 2010.
While looking for new drivers I found this document (PDF, 149 KB) which lists all the models Fujitsu is going to support if you install Windows 7 on it.
Good news: Following Tablet PCs are “supported”:
P1610, P1620, T4220.
Following Tablets are “fully supported”:
T1010, T5010, STYLISTIC ST6012
Being supported means, no yellow banged out devices with inbox drivers, drivers from Windows Update or drivers for Vista from Fujitsu website. Windows 7 x64 is “unsupported”, but it works, too. Even Sierra Wireless 3G on P1620. But using it with less than 4 GB of RAM makes no sense.
Being “fully supported” means systems are WHQL certified for Windows 7 and a complete set of drivers for Windows 7 is available.
Fujitsu promises BIOS updates for P1610, P1620 and T4220 for end of November. Stay tuned.