Emblazon this with a big “rumor” label, but according to The Register, Microsoft may be caving into OEMs.  As we know, OEMs can offer users of certain versions of Windows Vista a downgrade to XP.  For some OEMs, this can mean they will actually downgrade the PC for you, prior to shipment.  For others, this means an XP install CD with your shipment.According to The Register, while partners originally had up until January 31 2009 to provide the Windows XP Professional recovery media with machines