This bug has been bothering me for some weeks now. I decided to try
Thunderbird (under Windows!), because of its conversation-view
capabilities, and wanted it to be used by some computer-illiterates as
well, but this redownloading IMAP-stuff reduces Thunderbird to a small
incrowd aware of gloda and dirty cache only.

I Googled the origin of the problem: I found some very intersting
comments dating from 2009 about some messages not completely
downloading:

https://bugzilla.mozilla.org/show_bug.cgi?id=341225 
Bug 341225 -IMAP: Thunderbird caching incomplete downloaded

https://bugzilla.mozilla.org/show_bug.cgi?id=468595 see comment 17 about
the risk of a fuzz factor heuristic to fall down, which it does in our
case.

This heuristic seems to be a workaround for not downloading messages
completely by different threads, (inline images and attachments), while
for some reason the download of a part marks the download of the rest as
done.

So I guess anyone willing to fix this issue should separate these two
download-statusses and kill this previous workaroud.

** Bug watch added: Mozilla Bugzilla #341225
   https://bugzilla.mozilla.org/show_bug.cgi?id=341225

** Bug watch added: Mozilla Bugzilla #468595
   https://bugzilla.mozilla.org/show_bug.cgi?id=468595

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

Title:
  Thunderbird heavy IMAP traffic downloading messages

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