Computerworld says that the originating software stamps on four images posted on a Microsoft Web site are shown as "Adobe Photoshop C3 Macintosh" in their file properties.

The Microsoft commercial is a takeoff on the Apple commercials in which a nerdish man with some resemblance to Microsoft founder Bill Gates says "I'm a PC" while a thinner, younger hipper guy is a "Mac."

Best-selling author Deepak Chopra and Canadian adventurer Geoff Green, founder of Students on Ice Expeditions, are among those identifying themselves as "PC" in the Microsoft commercial. Another is a Microsoft engineer who happens to look like the actor playing the "PC" in the Apple campaign.