An rather unusual Windows 7 launch campaign can be found in Japan with Burger King's launch of a Windows 7 Whopper.

Fitting in with the software theme, the burger stacks seven patties in an otherwise normal Whopper and measures 5.1 inches tall. It also has an appropriate 777 yen ($8.53) price.

The stunt isn't unique for Microsoft's Windows 7 launch, which in the run-up to Thursday's introduction has repeated the "seven" theme in multiple publicity events; it launched a giveaway of the new OS for every resident of the Dutch village of Zevenhuizen ("Seven Houses") and decorated parts of the Spanish village Sietes ("Sevens") in Windows-themed colors.

The campaign contrasts sharply against the more traditional ads of Vista and earlier Windows releases, highlighting Microsoft's desire to turn around its public image.

In North America, most of the developer's less conventional advertising has centered around promoting Windows 7 house parties and its first retail stores.