Hi, I wanted to share with you this " little bad experience". I upgraded from B125 to B131 (and lost my Swiss Keyboard layout), to have a preview of OSOL 2010.03 ... I then just launched Thunderbird (which is version 3.x instead of 2.x) and didn't loggued in.
OK. Nothing wrong here. So, when I decided to reboot with my previous build (with Thunderbird 2.x), I discovered that my Lightning add-on, not only was disabled, but was not enbale at all => No more access to my calendar with Lightning. A nice message warned me that "my data has been upgraded by a more recent version of lightning". Workaround: ======== * So, if you want to restore your addon (and loose your calendar settings, sorry), you'll need to move elsewhere (or delete) the sqlite db file named "storage.sdb" which should be in your thunderbird profile directory. * Other alternative: upgrade Thunderbird to V 3.0 and install Lightning 1.0b to recover you calendars. So, if you decide to upgrade OSOL, thing about the "major upgrades" of the applications and their impact on your actual data. The same think happened with Firefox witht OSOL 2009.06
