Chester Freeze writes "During the holiday season, many shoppers bought PCs with the promise of quick, free Vista upgrades. The reality has been something else entirely: many Dell and HP customers are being told that they won't receive their copies of Vista before April. 'One source at a major OEM who spoke on condition of anonymity said that the real issue is that OEMs are still not sure which PCs are really ready to support Vista, and which PCs aren't... Customers who qualify for an Express Upgrade also qualify for OEM support for Windows Vista, even if their machines came with Windows XP. The last thing a Dell, Gateway, or HP wants to do is start sending out upgrades to customers who might have video cards that do not have particularly stable drivers yet (or sound cards, or RAID controllers, etc.). This could be a support disaster.'"