> Note that buyers may legitimately copy an XPm Pro disk and 
> time and install it.
>   
Yes you can use existing media to excercise the downgrade rights but 
there are several advantages to having the OEM provide downgrade media 
(as MS allowed big brand OEMs to do after some initial complaints) and 
do the downgrade install.

1: If you use your own media and that media is whitebox or reail media 
or media from the wrong big brand OEM afaict you will  have to telphone 
activate, not an issue for those with access to legit VLK media/key but 
potentially a majort PITA for some.
2: It saves you the hassle of actually doing the install
3: If the manufacturer is offering XP preinstalled then you will almost 
certainly be able to easilly download XP drivers
4: dell at least will provide telephone support for both XP and vista 
when you choose this option.
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