I wonder is one of the reasons this is happening because Thunderbird works well with PGP, Enigmail and Torbirdy etc and that many of the online guides which show people how to use this?
Wouldn't surprise me if that's the case, or at least if it's a factor in increased downloads. My default mail client on Windows is Postbox, but ever since I started using PGP, I switched to Thunderbird because Enigmail doesn't play nice with Postbox.
Thunderbird's UI could be a bit better but it performs well and does its job without causing too much trouble, so I'm quite happy with it.
Yeh, the UI could really do with an update. It would be great if it looked like OS X Mail etc but I guess most open source stuff often looks a bit dated - and Thunderbird does the job pretty well.
