De-authorize dead or old computer from itunes

Question

I already know that I can deauthorize 5 computers(once a year), but what about deauthorizing less than 5? I have worked on 4 different computers through work and at some point have authorized all of them to play itunes. Since upgrading, i have forgotten to deauthorize them.
Where would I find the list of all authorized computers?
How do i de-authorize them?

Answer 1

You cannot yourself deauthorize a computer that's not working or to which you no longer have access. You can authorize a total of up to five systems, so it's probably not really important that you deauthorize your dead unit now. Once you reach five total authorizations, a button will appear in your iTunes Music Store account that will allow you to deauthorize all your systems, so that would at that time recover the now-useless authorization.
If for some reason you really feel you need to deauthorize that system now, you can try contacting the iTunes Music Store customer support department through the form at the bottom of their web page and explaining the problem to them. They might be willing to clear your authorizations for you.