In the past I have managed to get both more than 10 connections and more that one website on a Win2k Pro box. I did it by hacking around with the metabase to make it look more like a Win2k Server box.

I did it because while I had the Win2k Server licences I wasn't being allowed to reinstall the OS on the box it was intended for. Office politics...

Last time I tried it though it failed. I think Microsoft must have got wise to it and "fixed" it in a service pack/hotfix.