[Bug 603402]

[M-wada-7]

FYI.
I've opened Bug 1124924.
Bug 1124924 - If CONDSTORE is usable, use "uid fetch 1:* flags (CHANGDEDSINCE modseq)" for new mail check by Biff instead of "uid fetch NextUID:* flags", in order to resolve problem like Bug 693204, Bug 517461

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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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