Microsoft's newest ad campaign featuring comedian Jerry Seinfeld was widely panned by bloggers and reporters for being mostly irrelevant or unfunny, but marketing experts say it has won the technology giant a unique PR opportunity. The ad, which began airing last week, follows founder Bill Gates and Seinfeld in a meandering conversation that takes place in a discount shoe store. Many have speculated that the ad is Microsoft's answer to Apple's “Mac versus PC” ads, which portray PCs as boring ...