I have tried to find out the solution on different forums to getting Acrobat 9 to use Thunderbird as it's email client. Doesn't seem to be any actual replies . However, I am running with a slightly new issue with this. I have finished what requires to be done to make Thunderbird as the default program for email client. Even I moved into the registry to make sure . However, whenever, I try to send a document off, it continuously suggesting me that it is unable to open Eudora. Currently , Eudora USED to be my default mail, but as I stated that I have changed that. Not only I have configured to the default, but I even removed the program, and even moved as far as to move into my windows registry to remove this from my Client\Mail part. Is there an option that I require to locate in Acrobat to restrict this from searching for Eudora? The error message states that it can't access C:\Eudora\Eudora.exe. Duhh, it's not even on my computer at all .