[gulmatan]

Let's say you bought your sixth Mac. Now, since you've already used up all five iTunes/iTMS accounts with account joeschmoe@xyz.com, you need to re-set the counter. When you use "Deauthorize All Conputers," how can you use your account, joeschmoe@xyz.com on the new sixth Mac? In other words, how can you set up this new machine with your old account info for this sixth machine?

[TETENAL]

There is no "Deauthorize All Computers". You can deauthorize one of your existing 5 computers from that computer and after that you will be able to authorize the new one.

[saddino]

Originally Posted by TETENAL

There is no "Deauthorize All Computers".

Actually, there is (but it only appears if you've used up your authorizations):

f you find you have reached 5 authorizations due to system upgrades, you can reset your authorization count by clicking Deauthorize All in the Account Information screen. Note: You may only use this feature once per year. The Deauthorize All button will not appear if you have less than 5 authorized computers or if you have used this option within the last 12 months

[Big Mac]

I imagine it means deauthorize all [other] computers, leaving only the one doing the deauthorizing as authorized.