I think the 2000 you refer to is the windows operating system software. Lotus does not come in versions like that. Lotus SmartSuite (which includes the suite of programs, Word Pro, Lotus 123, Approach, and a few others) ver 9.7 is fully compatible with windows editions before Windows XP, which includes Windows 2000. The very latest version of Lotus SmartSuite as far as I know is 9.8.
This version has been written to be fully operational with Windows XP.