Hey, PC, Who Taught You to Fight Back?

SEAN SILER would never be mistaken for a movie star. A former Navy officer who wears glasses and is a tad on the heavy side, Mr. Siler works at Microsoft, where he oversees the Windows division’s adoption of new Internet connectivity software called IPv6.

But there were audible gasps last summer when Mr. Siler, 39, auditioned for Microsoft’s new ad campaign for Windows, created by Crispin Porter & Bogusky, the Miami agency best known for its cheeky work for Mini Cooper and Burger King. “I was like, ‘Are you kidding?’ ” recalls Rob Reilly, one of the agency’s executive creative directors. “It couldn’t have been more perfect.” Everybody agreed that Mr. Siler looked exactly like PC, the character played by the comedian John Hodgman in Apple’s popular “Get a Mac” ads that lampoon Windows-based computers and those who love them. Two weeks later, Mr. Siler reported to a nearby television studio. The agency dressed him in PC’s dorky uniform — white shirt, baggy khakis, brown sport coat and matching brown tie — and handed him a script with the lines: “I’m a PC. And I’ve been made into a stereotype.”