Authorizing ADE on both computer and device

Sometimes ADE gets its registration/activation confused and in a semi-authorized state.

This often happens an a reinstall/upgrade.

Uninstalling and reinstalling does not help.

Unfortunately, it often then gives misleading error messages about what is wrong.

A common incorrect message informs you that the ID is already in use on another computer and cannot be reused.

Another is  "E_AUTH_NOT_READY"

This can often be resolved by completely removing any authorization using ctrl-shift-D to the Library screen on ADE (cmd-shift-D if on Mac).

Restart ADE, and then reauthorize with your (old) Adobe ID.

In extreme cases on the mac, the following extra step has helped some people.  Navigate to /Users//Library/Application Support/Adobe/Digital Editions and drag the activation.dat file to the trash. If you are using 10.7, see Access hidden user library files | Mac OS 10.7 Lion. http://forums.adobe.com/thread/1265248?tstart=0

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Once you have done that you should be able to authorize your  new Nook.

It is important that you use your original Adobe ID, then you should be able to read all your boooks (new and old) on ADE and on both Nooks.