How do I deauthorize all computers associated with my Apple ID?

Hi all,

First post on Apple Support Communities :-)

When I bought my first Apple product (iPad 2) a few months ago, I didn't know anything about Apple IDs, iTunes Store, Home Sharing and Computer authorizations. I experimented a little with iTunes and home sharing in VMware virtual machines (Windows 7) on my computer (Ubuntu). I quickly used up the 5 authorized computers, so I used the "Deauthorize all computers associated with your Apple ID" feature in iTunes and kept on experimenting (since I couldn't get things to work properly in my virtual environment).

Now I have an iPhone 4S and my daughter has an iPod Touch 4G, and I'm planning on buying the new Apple TV. But I'm not going to because I can't have Home Sharing. I can't "clean" the authorized computers because I did it a few months ago and it is only permitted once a year.

It is possible to request an exception (and how?) and have the authorized computers cleaned up?

Thanks a lot

Sebastien