>I am working with c++ .net and directx. I have directx 8 at home and directx 9 at work and when I attempt to build a piece of code that runs at home it will not build at work. I get several 'Unresolved Token' LNK2020 errors. Does anyone have some insight into the exact cause of these errors? Any help would be appreciated. Thanks!

Unresolved Tokens are where you compile against information that may not be in the libs or you are missing libs in your project properties for the linker.

Check to make sure the directx libs are in the linker include directories also.

At home you have 8 and at work you have 9 and at work is your problem, right?
If its the other way around you may be using functions not defined in version 8.

Good luck!