Trouble with Outlook 2013, especially with the upgrade from 12/8

[Sebastian Hagedorn]

--On 11. Dezember 2015 um 14:18:32 +0100 Sebastian Hagedorn via Info-cyrus 
<info-cyrus at lists.andrew.cmu.edu> wrote:

> we've always had more problems with users of Outlook than other clients,
> but in recent days they have become much graver. A number of users have
> lost mail in a way that we couldn't recover, even though we are using
> expunge_mode: delayed. There seems to be some correlation to this upgrade
> from Microsoft:
>
> <https://support.microsoft.com/en-us/kb/3114349>
>
> However, details are vague. There seem to be two types of problems:
>
> 1. Folders aren't synched with the IMAP server. There seems to be no
> indication of that in the UI, but has the consequence that mail for that
> folder is stored locally on the PC only. When the upgrade above is
> installed, something resets, which has the result that the local copies
> are purged. Since there are no copies on the server, the mails are lost.
>
> 2. Folders are moved unexpectedly when you move or rename a folder. This
> is mentioned in the release notes above as a supposedly fixed bug. It
> certainly has happened prior to the upgrade, but it's less clear if the
> bug is really fixed. This is especially harmful if the folders are moved
> to the Trash.
>
> We were able to undelete some such folders, but according to at least one
> user (some) mail or folders inside those folders were lost. We can find
> no evidence of that in our logs.
>
> Has anybody else observed issues like these? We are running 2.4.18, FWIW.

Sorry, it's 2.4.17. I have a follow-up question after talking to a user on 
the phone. Here's her current directory layout (partially redacted):

$ tree -d
.
|-- 01_ArbeitDiversity Trouble
|-- 01_ArbeitFuturologie
|-- 01_ArbeitGermanistentag 2016
|-- 01_ArbeitHB Literatur und Recht
|-- 01_ArbeitKosmologien
|-- 02_K&APY-ln1_CO_Poststrukturalismus
|-- 02_K&APY-ln1_HS_Atlantis
|-- 02_K&APY-ln1_HS_Pikaro
|-- 02_K&APY-ln1_HS_Science Fiction 1900
|-- 02_K&APY-ln1_VL_Literatur und Medien 1600 - 1900
|-- 02_K&APY-lnHausarbeiten WS 2014_15
|-- 02_K&APY-lnKlausuren
|-- 02_K&APY-lnVerwaltung
|-- 02_K&APY-lnmdl Pr&APw-fungen
|-- 03_Uni
|-- 03_UniPromotion xxx
|-- 03_UniPromotion yyy
|-- 04_Stellenmarkt
|-- 04_Stellenmarktxxx
|-- 04_Stellenmarktyyy
|-- Deleted Messages
|-- Drafts
|-- ESET Antispam
|-- Gel&APY-schte Elemente
|-- Gesendete Elemente
|   `-- Notes
|-- Infected Items
|-- Junk-E-Mail
|-- Notes
|-- Sent
|-- Trash
`-- sent-mail

32 directories

She claims that prior to Wednesday afternoon those folders were 
hierarchically ordered. There was a folder "01_Arbeit" that contained a 
folder named "Futurologie" and so on. I believe her, because she says she 
worked with a webmailer, her iPhone and Outlook 2013, and was able to see 
that hierarchy and all her mails on all clients. What baffles me is that 
all I find in our imapd.log files is this:

/var/log/imapd.log.2.gz:Dec  9 17:18:40 clotho imap[9137]: Rename: 
user.xxx.Gesendete Elemente.Notes -> DELETED.user.xxx.Gesendete 
Elemente.Notes.56685460
/var/log/imapd.log.2.gz:Dec  9 17:18:41 clotho imap[9137]: Rename: 
user.xxx.Gel&APY-schte Elemente.xxx -> DELETED.user.xxx.Gel&APY-schte 
Elemente.xxx.56685461
/var/log/imapd.log.1.gz:Dec 10 13:13:33 clotho imap[30707]: Rename: 
user.xxx.01_Arbeit -> user.xxx.Gel&APY-schte Elemente.01_Arbeit
/var/log/imapd.log.1.gz:Dec 10 13:13:40 clotho imap[30707]: Rename: 
user.xxx.02_K&APY-ln -> user.xxx.Gel&APY-schte Elemente.02_K&APY-ln
/var/log/imapd.log.1.gz:Dec 10 13:13:50 clotho imap[507]: Rename: 
user.xxx.03_Uni -> user.xxx.Gel&APY-schte Elemente.03_Uni

Our logs go back 7 days, and there are no other Renames previous to those.

Is it at all possible that some operation changed the folder layout without 
corresponding Rename entries in imapd.log? I'm a little scared that an 
Outlook bug triggered another bug in Cyrus IMAP.
-- 
    .:.Sebastian Hagedorn - Weyertal 121 (Gebäude 133), Zimmer 2.02.:.
                 .:.Regionales Rechenzentrum (RRZK).:.
   .:.Universität zu Köln / Cologne University - ✆ +49-221-470-89578.:.
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