The best way would be to buy QuickTime Pro from Apple (29.95 USD).
It won’t be a conversion internal to PPro as you will have to export a Master clip, but an extra disk drive and a 30 dollar piece of software is still cheaper than most standalone transcoding applications…
TimK,
Director,
Kolb Productions,
Creative Cow Host,
Author/Trainer
http://www.focalpress.com
http://www.classondemand.net