Hello Tom,
Windows 2000 has been launched the 12 December 1999.
Windows 2000 reached the end of its lifecycle on 13 July 2010. It will not receive new security updates and new security-related hotfixes after this date (
source : wikipedia).
The LiberKey Platform is still validated on windows 2000 (depending on your configuration, you will need to add some dll's like gdiplus).
BUT, we have removed windows 2000 in LiberKey Applications validation process. So from now, we will maintain the windows 2000 compatibility information ONLY from the author/editor information. No more test will be done on Windows 2000.