The fact that they haven't invested in anything resembling a companion set of services for shared calendar/contacts is also a heavy pain point in contrast to the use of GMail or Outlook/M365/Exchange. If they had offered hosted email/calendar/contacts alone as a monetization option, they could have done so well ahead of GMail or M365 options and could still do so and under-cut them... having an open-core suite just for communications.
They've left a lot of options out there to die... they effectively had Electron a few decades before Electron was a thing. XulRunner was pretty nice to use, and they just left it to die... it got worse over time and just stopped seeing updates. All the while, the charity org and business org just kept spinning their wheels and basically throwing money away... for decades now.
In these years, I've also had it on Windows and Linux, I've migrated it easily across many OS installs and hardware changes, I've used it with different kinds of email accounts and servers. It's worked with PGP encrypted mail, with SpamAssassin on the server and more.
It's great. It doesn't change much, which is probably a good thing, Firefox lost me as a user at some point. Thunderbird mostly stays the same, adding features occasionally. As I write this, I realize I'm so used to Thunderbird I'm not even sure what other clients are available. Definitely one of the best programs I've used.
Its a beautiful open source effort but products that have bugs like that languish for 10-20 years just aren't reliable. I need my mail client to be reliable.
But we should not spread FUD. If you can link to the bug I'd be interested, otherwise it doesn't add much value to claim this.
* there are rare cases of a profile either misplaced (exists but not correctly pointed to) or gone - it is something which I understand Firefox people are working on (Thunderbird uses the Firefox profile system) * there are extremely rare reports where prefs.js is corrupted * there are no compact failures in current versions - there are no open bug reports for recent versions, so it has been totally obliterated by a rewrite and subsequent fixes. Most user reports of compact failure are attributed to other causes of folder corruption * folder corruption can occur as easily from external sources as from product bugs.
Anyone who has a problem can file a support request at https://support.mozilla.org/en-US/questions/new/thunderbird to get assistance.
Also, beware drawing broad conclusions about other users' experience from one's own personal experience. I have almost never experienced corruption - once in the last 10 years. But I am also using a Thunderbird profile that has gone through 5 different laptops, two different OS, using daily builds, which is AMPLE opportunity to have had multiple catastrophic failures. But because I know other users experiences I consider myself lucky.
2. doesn't cut trackers
https://www.reddit.com/r/SaaS/comments/1g0m0um/how_to_set_up... is what I did.
I'd rather use Google's web storage than my own. I don't have the time nor the expertise to implement multi-region replication etc.
I understand that granting Google access to one's emails might be a dealbreaker for journalists, dissidents etc, though - so clearly Gmail is no good if you have legitimate need for PGP.
I would argue everyone does, most people just don't really think about what they are giving away. And how many emails a day are you receiving that a daily or hourly incremental offside backup wouldn't give you almost all of the benefits of "multi region replication"?
They used to still offer "basic HTML" gmail, which was waaaaaay better all around and was the only way I used it on any platform, but they discontinued that some time back.