After getting all existential during the first two videos in its $US300 million campaign to burnish Windows’ image, Microsoft gets a lot more specific in its third.

The brand-less, existential adventures of 90s comedian Jerry Seinfeld and recently-retired founder Bill Gates over the past two weeks are replaced by a clip featuring one Sean Siller (pictured right), a Microsoft employee who bears an uncanny resemblance to the “PC Guy” in the Mac Guy vs PC Guy commercials – the wildly successful Apple campaign that Microsoft targets with its new video.