There are ongoing issues with Thunderbird for quite some time now: as Mozilla Foundation’s mission evolved over time, Mozilla decided to stop further development. Today Thunderbird is released as a community project, and as a result Thunderbird has become a lower priority. It now lacks the resources it desperately needs to move forward – Thunderbird community is struggling to keep this important project up and running.
Encryption add-on Enigmail and pretty Easy privacy (p≡p) are joining in development of a solution for the well-known mail client Thunderbird. The goal is to make encryption as easy as possible, said Enigmail's project lead Patrick Brunschwig and p≡p's head of development Volker Birk in a common press release. Enigmail and p≡p will offer p≡p technology for any Thunderbird user. Thunderbird is still most popular among free email programs on desktop PCs and Laptops.