Here's how I did it on Solaris with Opera 7.23.
First edit prefs.js file from thunderbird directory and add this line:
user_pref("network.protocol-handler.app.http", "/local/utils/tools/bin/operanw");
/local/utils/tools/bin/operanw is a bash script which contains:
#!/bin/sh
/path_to_opera/opera -newpage $1
Now try to click a link from thunderbird. It works. For other protocols such as ftp or
https add same line in prefs.js and don't forget to chnage http with https or ftp...
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Home, no matter how far...
http://www.home.ro
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