Or maybe the problem is with Thunderbird 0.7.2
Whichever it is, on some machines the mailto links work fine. Click on one (in Firefox) & a Thunderbird Compose window opens. On other machines the Compose window only opens if Thunderbird isn’t already running. If Thunderbird’s running when you click on the mailto link in Firefox then it appears as if nothing happens. By looking closely at the taskbar you can see that the focus has shifted to Thunderbird, but no Compose window opens & nothing comes to the foreground-so to the casual user it appears as if nothing has happened.
This problem appears to be affecting mailto links in Internet Explorer too-but I’m not sure whether or not it’s the same problem. On the machines having problems, clicking a mailto link in IE generates an error message that the default mail application is not installed properly. If it’s looking for OE then that’s correct (although I’d say not configured vs. not installed-but close enough, maybe). If it’s looking for Thunderbird then I don’t know what the problem is-Thunderbird works fine except from the mailto links.