[Bug 603402]

[LonelyPixel]

Not sure what smartphones you have there but I have a permanent IDLE
connection from mine, as on the desktop with Thunderbird. If disabling
IDLE in Thunderbird is part of the workaround, then I think IDLE
implementation is the problem. I'm not using IDLE for fun, I want to see
new messages as they arrive. That's how modern event-driven systems
work. Polling is from the 90s.

But since nobody was able to even locate the problem as of today, and
given the open secret that Thunderbird is merely in maintenance mode for
quite some time, I don't believe anybody is able to fix this issue (and
others) without rewriting it all. If only I had more time...

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https://bugs.launchpad.net/bugs/603402

Title:
  Thunderbird incorrectly shows some Gmail archived messages as unread
  via IMAP

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