IMAP synchronization question

Andrew Sutherland asutherland at
Sat Aug 17 16:51:02 UTC 2013

gmail recently turned on CONDSTORE support a few months ago for 
everyone, rolling it out over time. This may have changed how 
Thunderbird synchronizes gmail significantly.  There is a UseCondStore 
pref set on the incoming server.  You can try turning it off and see if 
things go back to the way they used to work.

Ah, he were go after some googling, bienvenu says on
gmail recently added support for condstore. You could try telling 
thunderbird not to use condstore (it's a hidden pref, setting 
mail.server.default.use_condstore to false will turn it off for all 
servers). The partialuidfetch is done when we use condstore, so if 
turning off the use of condstore fixes the issue, that would be evidence 
that the partialuidfetch is involved.


On 08/17/2013 05:43 AM, Jonathan Protzenko wrote:
> Hi,
> I've encountered a weird behavior that I managed to tame some years ago
> using a combination of hidden prefs, but that I can't seem to fix now.
> The problem could be summed up as "Thunderbird figures out there are
> new messages in my IMAP folders but does not download them".
> In more detail:
> - the folder pane tells me there are 10 new mails in my "tb-planning"
> folder,
> - I click on the said folder, and then the 10 mails do _not_ appear,
> - Thunderbird works for quite some time (connecting to server, opening
> folder tb-planning, downloading new messages...),
> - finally, the messages arrive.
> The frustrating thing is that if I go offline, and ask Thunderbird to
> download messages, it will aggressively fetch messages from other
> folders.
> Am I missing something or is it just the expected behavior?
> Thanks,
> jonathan
> PS: this is a Gmail account, so it may be a case of "Gmail does not
> support imap extension X"
> PPS: I just checked: I'm subscribed to all folders, the faulty folder
> is selected for offline use, and I do have the hidden pref
> mail.server.default.check_all_folders_for_new set to true!
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