My Toughbook (CF-19) has a 'Windows Vista Business OEMAct, Panasonic' COA on the bottom of the unit. When I extracted the key before reformatting - it was a 'Windows XP Professional' Product Name and the Product ID code has 'OEM' in it...and I can confirm this upgrade was last OS installed (w/ Service Pack 3) - but there was the tablet functionality.
This extracted product key isn't working with any version of Windows I try installing. XP Pro, XP Pro Tablet 2005 OEM, Tablet XP OEM. Any insights?