Is there a client, and did said client specifically ask for a .wmv? and/or do you know which version of PPT that will be used?
I'm asking because .wmv has been supplanted by H.264 in the most recent version of PPT (if not the previous, as well)
If that's what the client wants/needs, of course give them that. But I have stopped supplying most if not all of my PPT clients with .wmvs. Most have switched over to H.264.
When in doubt of the power of the machine that will play the videos back, I give clients two copies. One high-quality and one medium-to-low quality. I tell them to try the good-looking one first, and if that doesn't work, they either should get a different computer for the presentation or settle for using the lower-quality one.
I can't give you any specifics, however. It's been a long time since I've encoded a .wmv for PPT, and I can't recall the settings. I have an H.264 preset in Compressor that I tend to use now.
debe