Microsoft "I'm a PC" ads, made by Mac?

"Maybe you hear it already, I knew it about 2 weeks ago. But I didn't have opportunity till now. So I will make it short."
About 2 weeks ago, I read news that said microsoft just made an ad titled "I'm PC". But few days after it's published, people who saw it try to check the METADATA of the ads pic.

And BANG, Title "I'm a PC" and created with "Adobe Photoshop CS3 MACINTOSH". Not a PC??

This is the METADATA screenshot :


Microsoft issued the following statement on the matter:

"As is common in almost all campaign workflow, agencies and production houses use a wide variety of software and hardware to create, edit and distribute content, including both Macs and PCs.”

You can open the ads @ ImaPC.lifewithoutwalls.com.

I want to make as short as possible, remembering it's not a new news.
You can find more by searching at google. and maybe you want to take a look:
http://digitaldaily.allthingsd.com/20080919/hi-im-a-pc-and-i-was-made-on-a-mac/