I have been using an old version of Thunderbird on my old, pre-Intel chip Mac desktop machine (vintage 2004) for many years. I am trying to transfer all of my internet-related business to my slightly newer Macbook Pro (vintage 2008, running OS 10.6.8). Firefox is running fine on that machine (admittedly not the latest version, but a perfectly workable one for me); but when I tried to install Thunderbird, Mozilla told me that I could not do it at all. Is there a way to still get earlier versions of Thunderbird from a very trustworthy source? (I searched "older versions of Thunderbird" and came up with some places called oldapps.com and oldversions.com -- not sure I would want to get something from a site I know nothing about!). I am resistant to the idea that I just need to dump my older machines (it's against my religion -- this constant updating and buying new machines and trashing the old ones is just one way we are trashing our soon-to-be-uninhabitable planet). Although Firefox on my G4 processor desktop was getting too old and creaky to work with, Thunderbird was working for me just fine (no problems in all the many years I've used it), and I am not willing to believe that an older version that would work on OS 10.6 wouldn't work just as well. All I need is a way to get to the latest version that is compatible with 10.6! thanks very much...