invalid,
Microsoft changed the way that IR works in Windows 2000 from the way it worked in Win95 and 98. The IR port no longer "looks like" a COM port to programs.
As a result, new drivers are required. See if the Motorola site has a W2K driver for your phone. If not, you may be stuck...
I had to wait quite a while until a W2K driver showed up on the Nokia site for my 8890.
David.