[Bug 1074260]

[Pe1chl]

Did anyone check what changed in IMAP or the folder management between TB15 and TB16 (or SM2.12 and SM2.13)?
Is it just a small change that causes these problems or has there been a rewrite of some sort?
Any chance of just backing out the change(s) and release a new update?

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https://bugs.launchpad.net/bugs/1074260

Title:
  Thunderbird heavy IMAP traffic downloading messages

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