[Bug 603402]

[M-wada-7]

FYI #1.
If CONDSTORE support of Tb is enabled(mail.server.default.use_condstore=true, or mail.server.server#.use_condstore=true), and if imap server supports CONDSTORE, bug 1123617 occurs even after go Work Offline/go Work Online again.
i.e. "Workaroudof this bug/recovery operaation of this bug",  go Work Offline/go Work Online again/explicitly open Mbox again, won't work due to bug 1123617 .
FYI #2.
If bug 1123617 will be fixed, this bug will be resolved by utilizing CONDSTORE, because change required for that bug is "uid fetch 1:* Flags (CHANGEDSINCE LargestKnowMODSEQ) upon each new mail check".

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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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