ok this seems weird. spotlight might be file based, but doesn't spotlight go based on filetype? so what is stopping someone from making a plugin that reads that database from thunderbird, parsing the data within, and then throwing it into spotlight? it seems like that database should be treated as a file regardless and then spotlight uses the correct plugin to parse and add the data. now i haven't written one or done any research on writing spotlight plugins but that seems like it would work to me. Shame on apple for not providing a better way to do this otherwise. In fact... i am SURE you can do this... why? Because Delicious-Library has a spotlight plugin... guess how that info is stored? In one XML file. i wouldn't doubt my theory being applicable here.