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If you've already got a Boot Camp partition using the beta, of course it will still work. The expiration of the beta means only two things:
1. Apple no longer provides the Bootcamp Setup Assistant for download.
2. No more driver updates.

Existing Bootcamp partitions will continue to work as well as they ever did, just none of the groovy new drivers provided with Leopard.
 
I see. The reason why I ask is I don't think I can convince my boss to pony up the cash for Leopard, just to be able to run windows. Thanks for your answers!
 
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