> FWIW - I have a signed letter from a high level Microsoft 
> rep in this country saying that if you buy a uSoft product 
> then you may for free use any older version. I keep it 
> 'somewhere' more for fun than expectation that it would hold 
> water. I suspect too (and seem to recall) that there are M$ 
> EULAs that say just the opposite.
>
>   
IIRC according to the actual licenses that is true for most volume 
licenses but not most retail licenses.

If you have OEM vista buisness  or ultimate then iirc that comes with 
downgrade rights to XP pro. If you have a lower edition but have access 
to purchase under a volume license scheme then iirc upgrading under that 
will also get you downgrade rights. Retail and retail upgrade copies 
unfortunately don't come with downgrade rights.
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