Unable to open links under Thunderbird
Under Mozilla Thunderbird, it may happen that you cannot open hypertext links.
Solutions
Launch Internet Explorer and set the browser as default.
If Internet Explorer refuse to set as default, close
Internet Explorer.
Now, launch Firefox and set it as default browser.
Then download install the freeware Setbrowser on below link:
http://www.pc-tools.net/win32/setbrowser/
Once the software installed, launch the SetBrowser and:
Step 1 : Opera / other
Step 2: leave the default values
Step 3: specify location (select the file firefox.exe, under
c: \ Program Files \ mozilla firefox)
Exit from Setbrowser