You can deauthorize the current account using Ctrl-Shift-D (Cmd-Shift-D on Mac). However please note that deauthorization strictly removes the account information from your computer and does nothing else. Very specifically it doesn't not increase your activation allowance. Repeated Authorization/Deauthorization, will lead to you running out of your alllowed activations, and you will need to submit a web request (http://www.adobe.com/support/digitaleditions click on 'Submit a web case')
If you mean to use both AdobeIDs then you are far better off, creating a new OS User Account, and then authorizing ADE on that account with your other AdobeID.
Thank you, Jim.
It really helped me and made my books achievable and readable - finally.
I'll have in mind concerning the second account under new OS name in order to avoid further disturbances.
P.S. Concerning web case - I've tried to do that but the "continue" button was inactive all the the time I was on the site. Do not know why?!
I have the similiar problem. I bought an ebook without authorizing it. later i authorzied the compuer, the book became unreadable. and later i de-authorized the computer, the book is still unreadable.
I realy have no idea of how stupid their digital right works. if they only allow us reading book after authorzing the compuer, they should remove the option from the prompt!
Please be more specific as to "creating a new OS User Account, and then authorizing ADE on that account with your other AdobeID."
I authorized my laptop with my email ID user name, but later when I authorized my netbook, I used a second adobe signon by mistake. Now I can't read half the books on my Nook as some had been authorized by one account and some by another. I would like to either deauthorize and reauthorize the second account, but uninstalling and reinstalling did not work. I will try the ctrl-Shift-D, once I see what should be open when I try that tactic, but if there is a way to have both accounts authorized on the same Nook, I would be happy with that. All I want is to be able to read all my stuff, regardless of which authorization I used. The idea of authorization concept creates a lot of confusion and issues.