jazzyrick

I recently encountered this problem as well. Being a fan of Firefox and Thunderbird, these were the default browser and email client. It actually seems the problem lies in Internet explorer and the way some of the updates change the way Windows handles these links??? I'm not sure exactly why or how, but I hadn't updated to IE7, simply because I didn't use IE, but upon being stumped for many days about this link problem I ran Windows update and installed IE7, because I was having a problem with IE Tab not quite working correctly as well. This completely fixed the link problem in Thunderbird as a not intended effect of trying to fix another smaller glitch I was having with IE Tab.

If you are having this link problem in Thunderbird and you haven't updated to IE7 do so and this should fix the problem if you've tried the other suggestions. This obviously is only valid with Windows...and likely only Windows XP.