There's a registry patch you can apply to Windows 2000 to get it to sync like XP does, but of course the extra applet pane isn't there.
https://www.timesynctool.com/ has a wonderful tool called Net-Time.
I've used Net-Time on all my computers from Win95 through to Vista, and I'm starting to install it on Windows 7. Works perfectly well, no issues at all.
The great thing is that if you don't bother with a battery or it's gone flat, Net-Time will fix the time, bypassing Microsoft's so-called "security" limitation (only allows adjustment if the time is no more than about 12 hours out).
I don't have ME, but I can't see any reason why it shouldn't work like all the other OS's.