Most of the Microsoft Cliparts that I plan to use are just line drawings, not
photos etc. At present they are only for my students, but in the future
would like to market some of my games. Not sure about copyright issues.

Check this thread out. It is similar to your question. Read the EULA given in
the thread for more information:
http://www.microsoft.com/office/comm...1-002ae61ed369
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"frustrated teacher" wrote:

> Most of the Microsoft Cliparts that I plan to use are just line drawings, not
> photos etc. At present they are only for my students, but in the future
> would like to market some of my games. Not sure about copyright issues.