iTunes Account Deauthorization

I have been syncing too many iOS devices with way too many computers. While I started to sync my first gen ipod to freshly setup iMac, I realized I had authorized 3 computers which I cannot even remember who they are. This iMac should be the only one syncing my account. So you want to know deauthorization.

You could easily deauthorize a computer from iTunes menu. If you want to deauthorize all computers at a time like I wanted to do, you might want to take a note on the conditions.

You may only use this feature once per year. The Deauthorize All button will not appear if you have fewer than 5 authorized computers, or if you have used this option within the last 12 months. If you need assistance on using this feature, please contact the iTunes Store support via email (http://www.apple.com/support/itunes/ww/).

In short, I need to authorize another pc to get all my unknown linked computers invalid!