[Bug 603402]

[Rsx11m-pub]

If I recall correctly, that's a case which the condstore feature is
supposed to cover. However, since the MailNews implementation is broken
(see bug 885220 and bug 912216) I wouldn't be surprised if it's an issue
prompted by that. I don't see this for non-Gmail servers which are not
using condstore, though changes in message status don't propagate
immediately either.

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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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