[autoexec]

I'd agree with you that the fact that the bug is still open after 17 years isn't the problem, but the issue is that people are still (as of 10 months ago) running into the issue of their mail being deleted. If they'd secretly implemented "safety measures" as you suggest that wouldn't be happening.

Looking at the timeline, it's possible that they've addressed a few of the bugs that result in data loss several years ago, and it's possible that the latest guy who ran into the problem within the last year triggered it in new ways or under new conditions but it's clear that the problem of thunderbird deleting messages from the server when copies haven't successfully been saved during a move operation wasn't solved by any "safety measures" 9 months ago and it's doubtful that it's been solved now.

My guess is that because thunderbird ultimately doesn't bother to make sure that messages are successfully and accurately copied before it removes them from the server it'll only be a matter of time before someone else stumbles on some other set of circumstances which results in data loss when messages are being moved.

[godelski]

Reading the bug report it is unclear to me if the newest one is the same bug. There are also other bugs referenced that look to be fixed.

  > If they'd secretly implemented "safety measures" as you suggest that wouldn't be happening.

But we can *VERIFY* that measures were taken. In fact, easily! We can look at the references at the very top of the bug report!

  - Title: move/copying multiple imap messages to local folder bypasses offline store and redownloads messages. Need to preflight the move/copy.
    Status: RESOLVED FIXED 
    https://bugzilla.mozilla.org/show_bug.cgi?id=505456

There are others that need to be hunted for but this one was trivial to find and was implemented pretty quickly. There are also other similar bugs that weren't marked as dupes. Some of these have been marked as resolved and fixed. That leads me to believe that they just don't know what exactly this bug is because they can't reproduce. It may very well have been resolved and new issues might be completely new bugs. I mean... it has been 17 years... and TB has undergone significant rewriting. Don't you think that the software changed quite a bit in that time?

Which all I'm trying to argue is that they didn't just sit on their asses and do nothing for 17 years

[thaumasiotes]

> But we can *VERIFY* that measures were taken. In fact, easily! We can look at the references at the very top of the bug report!

>> Title: move/copying multiple imap messages to local folder bypasses offline store and redownloads messages. Need to preflight the move/copy.

>> Status: RESOLVED FIXED

This might be a more compelling observation if the bug was related to data loss. This just says "if you have a local copy of something, read from that instead of reading from the remote server".

It addresses the specific observation made in the thread that you can encounter the data loss bug even if you already have local copies of the messages, because Thunderbird ignores those, redownloads from the server, fails, and then deletes everything. Now, if you have local copies, Thunderbird won't try to redownload them from the server and the fact that the data loss bug isn't fixed won't matter to you.

You could apply this same approach to the entire bug, by guarding the "delete all of the user's emails" action instead of the "move emails that already exist locally" action. But they don't.