Just try "trotting down to the local store" for a retail version of Windows XP - either Pro or Home here in Australia. Microsoft offered all of the wholesalers here a "buyback" deal on all their XP licences the last working day before Vista was released....now there is hardly an XP licence to be had anywhere.
So for all those who need an XP licence - good luck!.......hens teeth would be easier to find. GOOD ON YER MICROSOFT.....just another example of a power-mad corporation.