Not many people who know of Windows 7's imminent October arrival would be too anxious to buy a copy of Vista, so Microsoft is changing things up a bit.

Six new Vista SKUs are coming very soon that will contain a voucher for a free upgrade to Windows 7, though there will be a small charge for shipping. The six Vista versions will be both 32-bit and 64-bit varieties of Ultimate, Home, and Business Vista. The free upgrade will be offered for the Win 7 equivalent of these Vista versions.

So if you are about to buy Vista, hold off! You'll definitely want to wait for the free Win 7 upgrade boxes to hit stores first, which should happen fairly soon.