Likewise. Long time Thunderbird user since the original 1.0 days, for both work and personal use.

There's been a few ups and downs along the way but I've found it generally "just works" and gets out the way, which is exactly what I want in an email client.

I've tried almost every single email client I could find on Linux, and several on Windows (including Pegasus mail, if anyone remembers that), but always come back to Thunderbird.

I've been a regular donator to the project ever since they spun it out to MZLA Technologies Corporation.