And I just noticed these in the Horde log:

2013-06-28T11:57:44+10:00 ERR: HORDE [imp] Could not open mailbox 
"user/chiarina/Trash". [pid 27633 on line 571 of 
"/var/www/horde/imp/lib/Imap.php"]
2013-06-28T11:57:45+10:00 ERR: HORDE [imp] Could not open mailbox 
"user/chiarina/Spam". [pid 9193 on line 571 of 
"/var/www/horde/imp/lib/Imap.php"]
2013-06-28T11:57:46+10:00 ERR: HORDE [imp] Could not open mailbox 
"user/chiarina/Sent". [pid 27665 on line 571 of 
"/var/www/horde/imp/lib/Imap.php"]
2013-06-28T11:57:48+10:00 ERR: HORDE [imp] Could not open mailbox 
"user/chiarina/Saved Emails". [pid 26020 on line 571 of 
"/var/www/horde/imp/lib/Imap.php"]
2013-06-28T11:57:50+10:00 ERR: HORDE [imp] Could not open mailbox 
"user/chiarina/Drafts". [pid 26404 on line 571 of 
"/var/www/horde/imp/lib/Imap.php"]

I note too that they have disappeared from Imp... :-(

I'll run a reconstruct and see if that helps.

Still something strange.

All working fine apart from the user/chiarina folder (which has 
current email in it).

On S4 - the folder itself syncs, but none of the sub-folders (which 
are all empty) appear.

On iPad - the folder does not sync at all, neither contents nor sub-folders:

2013-06-28T01:58:32+00:00 INFO: [26018] 
Horde_Core_ActiveSync_Driver::authenticate() attempt for simon
2013-06-28T01:58:32+00:00 DEBUG: [26018] SYNC request received for user simon
2013-06-28T01:58:32+00:00 INFO: [26018] Device entry exists for 
APPLDLXFT5X3DFJ2, updating userAgent and version.
2013-06-28T01:58:32+00:00 INFO: [26018] Request being handled for 
device: APPLDLXFT5X3DFJ2 Supporting protocol version: 14.1
2013-06-28T01:58:32+00:00 INFO: [26018] Handling SYNC command.
2013-06-28T01:58:32+00:00 INFO: [26018] Checking policykey for device: 
APPLDLXFT5X3DFJ2 user: simon
2013-06-28T01:58:32+00:00 INFO: [26018] Stored key: 9750313820
2013-06-28T01:58:32+00:00 INFO: [26018] Policykey: 9750313820 verified.
2013-06-28T01:58:32+00:00 DEBUG: [26018] I  <Synchronize>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I   <Folders>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I    <Folder>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I     <SyncKey>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I       
{51ccedaa-e4a0-4ad3-96cd-66a8c0a801e6}2
2013-06-28T01:58:32+00:00 DEBUG: [26018] I     </SyncKey>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I     <FolderId>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I       acca8b45
2013-06-28T01:58:32+00:00 DEBUG: [26018] I     </FolderId>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I     <GetChanges />
2013-06-28T01:58:32+00:00 DEBUG: [26018] I     <WindowSize>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I       25
2013-06-28T01:58:32+00:00 DEBUG: [26018] I     </WindowSize>
2013-06-28T01:58:32+00:00 INFO: [26018] Requesting WINDOWSIZE of 25
2013-06-28T01:58:32+00:00 DEBUG: [26018] I     <Options>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I      <FilterType>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I        2
2013-06-28T01:58:32+00:00 DEBUG: [26018] I      </FilterType>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I      <MIMETruncation>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I        1
2013-06-28T01:58:32+00:00 DEBUG: [26018] I      </MIMETruncation>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I      <MIMESupport>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I        0
2013-06-28T01:58:32+00:00 DEBUG: [26018] I      </MIMESupport>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I      <AirSyncBase:BodyPreference>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I       <AirSyncBase:Type>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I         1
2013-06-28T01:58:32+00:00 DEBUG: [26018] I       </AirSyncBase:Type>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I       <AirSyncBase:TruncationSize>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I         500
2013-06-28T01:58:32+00:00 DEBUG: [26018] I       </AirSyncBase:TruncationSize>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I      </AirSyncBase:BodyPreference>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I     </Options>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I    </Folder>
2013-06-28T01:58:32+00:00 INFO: [26018] Obtaining collection class of 
Email for collection id acca8b45
2013-06-28T01:58:32+00:00 INFO: [26018] Collection added to collection 
handler: collection: user/chiarina, synckey: 
{51ccedaa-e4a0-4ad3-96cd-66a8c0a801e6}2.
2013-06-28T01:58:32+00:00 DEBUG: [26018] I   </Folders>
2013-06-28T01:58:32+00:00 DEBUG: [26018] I  </Synchronize>
2013-06-28T01:58:32+00:00 INFO: Have syncable collections
2013-06-28T01:58:32+00:00 INFO: [26018] Replacing SYNC_CACHE entry for 
user simon and device APPLDLXFT5X3DFJ2: 
a:11:{s:18:"confirmed_synckeys";a:0:{}s:17:"lasthbsyncstarted";i:1372384687;s:17:"lastsyncendnormal";i:1372384683;s:9:"timestamp";s:10:"1372384712";s:4:"wait";b:0;s:10:"hbinterval";b:0;s:7:"folders";a:95:{s:8:"fd0bd446";a:2:{s:5:"class";s:5:"Email";s:8:"serverid";s:36:"INBOX/Saved Emails/Finances/Receipts";}s:8:"f2befa4e";a:2:{s:5:"class";s:5:"Email";s:8:"serverid";s:16:"user/server/Sent";}s:8:"ecc83c70";a:2:{s:5:"class";s:5:"Email";s:8:"serverid";s:26:"INBOX/Saved Emails/Shipito";}s:8:"ec696f9a";a:2:{s:5:"class";s:5:"Email";s:8:"serverid";s:12:"INBOX/Drafts";}s:8:"e5b142e7";a:2:{s:5:"class";s:5:"Email";s:8:"serverid";s:16:"user/server/Spam";}s:8:"e32c0da3";a:2:{s:5:"class";s:5:"Email";s:8:"serverid";s:27:"INBOX/Saved Emails/Finances";}s:8:"db37d9fd";a:2:{s:5:"class";s:5:"Email";s:8:"serverid";s:27:"INBOX/Saved Emails/Holidays";}s:8:"da17d510";a:2:{s:5:"class";s:5:"Email";s:8:"serverid";s:60:"INBOX/Saved Emails/Computer Stuff/Mailing 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2013-06-28T01:58:32+00:00 INFO: All synckeys confirmed. Continuing with SYNC
2013-06-28T01:58:32+00:00 DEBUG: [26018] O  <Synchronize>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O   <Status>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O    1
2013-06-28T01:58:32+00:00 DEBUG: [26018] O   </Status>
2013-06-28T01:58:32+00:00 INFO: [26018] Initializing state for 
collection: user/chiarina, synckey: 
{51ccedaa-e4a0-4ad3-96cd-66a8c0a801e6}2
2013-06-28T01:58:32+00:00 INFO: [26018] Loading state for synckey 
{51ccedaa-e4a0-4ad3-96cd-66a8c0a801e6}2
2013-06-28T01:58:32+00:00 INFO: [26018] Initializing message diff 
engine for acca8b45 (user/chiarina)
2013-06-28T01:58:32+00:00 INFO: [26018] 
Horde_Core_ActiveSync_Driver::getServerChanges(user/chiarina, 
1372384682, 1372384712, 1372125512, 0)
2013-06-28T01:58:32+00:00 INFO: IMAP status: Array
2013-06-28T01:58:32+00:00 INFO: NO CONDSTORE or per mailbox MODSEQ: minuid=0
2013-06-28T01:58:32+00:00 INFO: FETCHING VERB
2013-06-28T01:58:32+00:00 INFO: RETURNING VERB
2013-06-28T01:58:32+00:00 ERR: Unknown message.
2013-06-28T01:58:32+00:00 INFO: [26018] Found 0 message changes in acca8b45.
2013-06-28T01:58:32+00:00 DEBUG: [26018] O   <Folders>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O    <Folder>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O     <SyncKey>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O       
{51ccedaa-e4a0-4ad3-96cd-66a8c0a801e6}2
2013-06-28T01:58:32+00:00 DEBUG: [26018] O     </SyncKey>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O     <FolderId>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O      acca8b45
2013-06-28T01:58:32+00:00 DEBUG: [26018] O     </FolderId>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O     <Status>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O      1
2013-06-28T01:58:32+00:00 DEBUG: [26018] O     </Status>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O    </Folder>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O   </Folders>
2013-06-28T01:58:32+00:00 DEBUG: [26018] O  </Synchronize>
2013-06-28T01:58:32+00:00 INFO: [26018] Replacing SYNC_CACHE entry for 
user simon and device APPLDLXFT5X3DFJ2: 
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Emails/Computer Stuff/Mailing 
Lists/Horde";s:11:"lastsynckey";s:41:"{51c98eb4-a80c-4fc0-9b05-278fc0a801e6}182";s:8:"pingable";b:0;s:2:"id";s:8:"6eaa16c8";s:10:"pingchange";b:1;}s:8:"04ae6465";a:12:{s:5:"class";s:5:"Email";s:10:"windowsize";s:2:"25";s:10:"filtertype";s:1:"2";s:10:"truncation";i:0;s:11:"mimesupport";s:1:"0";s:14:"mimetruncation";s:1:"1";s:8:"conflict";i:1;s:9:"bodyprefs";a:1:{i:1;a:2:{s:4:"type";s:1:"1";s:14:"truncationsize";s:3:"500";}}s:8:"serverid";s:10:"INBOX/Sent";s:11:"lastsynckey";s:39:"{51c992ed-5ca8-4840-88f3-362fc0a801e6}2";s:8:"pingable";b:0;s:2:"id";s:8:"04ae6465";}s:8:"acca8b45";a:11:{s:5:"class";s:5:"Email";s:10:"windowsize";s:2:"25";s:10:"filtertype";s:1:"2";s:10:"truncation";i:0;s:11:"mimesupport";s:1:"0";s:14:"mimetruncation";s:1:"1";s:8:"conflict";i:1;s:9:"bodyprefs";a:1:{i:1;a:2:{s:4:"type";s:1:"1";s:14:"truncationsize";s:3:"500";}}s:8:"serverid";s:13:"user/chiarina";s:11:"lastsynckey";s:39:"{51ccedaa-e4a0-4ad3-96cd-66a8c0a801e6}2";s:8:"pingable";b:1;}}s:13:"pingheartbeat";b:0;s:
14:"synckeycounter";a:7:{s:8:"1540dc99";a:1:{s:40:"{51ccbef0-0e08-4af5-92d1-659ec0a801e6}65";i:1;}s:10:"@Contacts@";a:1:{s:40:"{51c91e7c-5c34-4746-b321-5b3cc0a801e6}30";i:1;}s:10:"@Calendar@";a:1:{s:40:"{51c91e89-1794-47fa-83f9-5b3cc0a801e6}10";i:1;}s:7:"@Tasks@";a:1:{s:39:"{51c91e97-5570-4c2f-b19b-5cebc0a801e6}2";i:1;}s:8:"6eaa16c8";a:1:{s:41:"{51c98eb4-a80c-4fc0-9b05-278fc0a801e6}181";i:1;}s:8:"04ae6465";a:1:{s:39:"{51c992ed-5ca8-4840-88f3-362fc0a801e6}1";i:1;}s:8:"acca8b45";a:1:{s:39:"{51ccedaa-e4a0-4ad3-96cd-66a8c0a801e6}2";i:0;}}}
2013-06-28T01:58:32+00:00 INFO: [26018] User simon logged off


On Outlook 2013: user/chiarina folder is empty, no sub-folders.

Messages like this in the logs:

2013-06-28T12:08:58+10:00 ERR: [26280] Heartbeat terminating: [26280] 
Empty synckey for 6ccea213  (this is user/benjamin/spam, which is an 
empty folder).
2013-06-28T12:08:58+10:00 NOTICE: [26280] Skipping 6ccea213 because it 
is not PINGable.

etc...
2013-06-28T12:10:31+10:00 ERR: [26280] Heartbeat terminating: [26280] 
Empty synckey for d194db3c (a newly created folder, with emails in it, 
that Outlook shows as empty).
2013-06-28T12:10:31+10:00 NOTICE: [26280] Skipping d194db3c because it 
is not PINGable.

2013-06-28T12:10:31+10:00 ERR: [26280] Heartbeat terminating: [26280] 
Empty synckey for e1ba98e3.
2013-06-28T12:10:31+10:00 NOTICE: [26280] Skipping e1ba98e3 because it 
is not PINGable.

And these for those three folders that return those errors:

2013-06-28T02:10:30+00:00 INFO: UNSETTING collection 
user/benjamin/Spam (6ccea213) PINGABLE flag.
2013-06-28T02:10:30+00:00 INFO: UNSETTING collection user/chiarina 
(e1ba98e3) PINGABLE flag.
2013-06-28T02:10:30+00:00 INFO: UNSETTING collection INBOX/Saved 
Emails/Aurizon (d194db3c) PINGABLE flag.

Will keep an eye on this and see if it re-occurs, but at this stage I 
think we are OK.

The sub-folders of user/chiarina still did not appear, but deleting 
the device and re-adding has resolved that.

Thanks Mike.

Changes have been made in Git (master):

commit 6ec71a0db684f9df2bf0202b2b972e15136a579f
Author: Michael J Rubinsky <mrubinsk@horde.org>
Date:   Mon Jun 17 14:02:08 2013 -0400

     Bug: 12316 Fix detecting changes when there is no 
CONDSTORE/MODSEQ available.

     Must use the same search query as in the original sync or else we run the
     chance of obtaining a UID that the client does not know about.

  .../lib/Horde/ActiveSync/Imap/Adapter.php          |    6 ++++++
  1 files changed, 6 insertions(+), 0 deletions(-)

http://git.horde.org/horde-git/-/commit/6ec71a0db684f9df2bf0202b2b972e15136a579f

I answered this myself. Fired up an old Exchange VM and you are 
correct. The email is filtered by the header date, not arrival time, 
so the email should NOT be shown, even if it was just moved into the 
mailbox. Creating a new ticket, since this really has nothing to do 
with this  one.

I'll be able to jump back in and try from 24th.

Bumping priority. Going to need to setup some VMs of Cyrus and/or 
Courier since I can't reproduce any of this locally using Dovecot - 
even with CONDSTORE disabled.

Sorry, just saw the other bug... It's been a long day, drove 1100km... :(

I'm confused, is this the same issue, or is this a thread hijack?

The only thing that makes *any* kind of sense to me is that your 
UIDVALIDITY is no longer valid. We were checking for this in the code 
path for MODSEQ, but looks like it was mistakenly omitted from the 
non-MODSEQ code.

Still, I wouldn't think that UIDVALIDITY would go invalid so quick on 
a modern imap server, but who knows. If this is indeed the case, it 
really sucks because each time this occurs, the client must refresh 
the entire state again since the UID data it has on each email is on 
longer correct.

Changes have been made in Git (master):

commit ba0c940f306713c26c1970990387450e4543273b
Author: Michael J Rubinsky <mrubinsk@horde.org>
Date:   Wed Jun 12 17:58:52 2013 -0400

     Check for invalid UIDVALIDITY

     Possible fix for Bug: 12316

  .../lib/Horde/ActiveSync/Imap/Adapter.php          |    1 +
  1 files changed, 1 insertions(+), 0 deletions(-)

http://git.horde.org/horde-git/-/commit/ba0c940f306713c26c1970990387450e4543273b

before the "if"

2013-06-12T20:44:50+00:00 DEBUG: Variable information:
array(0) {
}

Backtrace:
  1. Horde_Rpc_ActiveSync->getResponse() /var/www/global/horde/rpc.php:156
  2. Horde_ActiveSync->handleRequest() 
/usr/share/php/Horde/Rpc/ActiveSync.php:141
  3. Horde_ActiveSync_Request_Base->handle() 
/usr/share/php/Horde/ActiveSync.php:858
  4. Horde_ActiveSync_Request_Sync->_handle() 
/usr/share/php/Horde/ActiveSync/Request/Base.php:252
  5. Horde_ActiveSync_Collections->getCollectionChangeCount() 
/usr/share/php/Horde/ActiveSync/Request/Sync.php:383
  6. Horde_ActiveSync_Collections->getCollectionChanges() 
/usr/share/php/Horde/ActiveSync/Collections.php:1178
  7. Horde_ActiveSync_State_Sql->getChanges() 
/usr/share/php/Horde/ActiveSync/Collections.php:1169
  8. Horde_Core_ActiveSync_Driver->getServerChanges() 
/usr/share/php/Horde/ActiveSync/State/Sql.php:874
  9. Horde_ActiveSync_Imap_Adapter->getMessageChanges() 
/usr/share/php/Horde/Core/ActiveSync/Driver.php:669
10. Horde_ActiveSync_Folder_Imap->setChanges() 
/usr/share/php/Horde/ActiveSync/Imap/Adapter.php:385
11. Horde::debug() /usr/share/php/Horde/ActiveSync/Folder/Imap.php:95

2013-06-12T20:44:50+00:00 DEBUG: Variable information:
int(1)

Backtrace:
  1. Horde_Rpc_ActiveSync->getResponse() /var/www/global/horde/rpc.php:156
  2. Horde_ActiveSync->handleRequest() 
/usr/share/php/Horde/Rpc/ActiveSync.php:141
  3. Horde_ActiveSync_Request_Base->handle() 
/usr/share/php/Horde/ActiveSync.php:858
  4. Horde_ActiveSync_Request_Sync->_handle() 
/usr/share/php/Horde/ActiveSync/Request/Base.php:252
  5. Horde_ActiveSync_Collections->getCollectionChangeCount() 
/usr/share/php/Horde/ActiveSync/Request/Sync.php:383
  6. Horde_ActiveSync_Collections->getCollectionChanges() 
/usr/share/php/Horde/ActiveSync/Collections.php:1178
  7. Horde_ActiveSync_State_Sql->getChanges() 
/usr/share/php/Horde/ActiveSync/Collections.php:1169
  8. Horde_Core_ActiveSync_Driver->getServerChanges() 
/usr/share/php/Horde/ActiveSync/State/Sql.php:874
  9. Horde_ActiveSync_Imap_Adapter->getMessageChanges() 
/usr/share/php/Horde/Core/ActiveSync/Driver.php:669
10. Horde_ActiveSync_Folder_Imap->setChanges() 
/usr/share/php/Horde/ActiveSync/Imap/Adapter.php:385
11. Horde::debug() /usr/share/php/Horde/ActiveSync/Folder/Imap.php:96

Not picked up. When I add a new sub folder it shows that, but still 
not existing ones.

Could have told you yesterday... :) left my job that had Exchange AS.

I'm away for ten days now, will have a look with debug code when I return.

I lied. This is coming from ActiveSync code, but I'm not sure how you 
are reaching this. Can you place the following code in 
Horde/ActiveSync/Folder/Imap.php after line 95, but before the 
exception is thrown on line 97:

                         Horde::debug($this->_messages);
                         Horde::debug($uid);

This will output a log file name horde_debug.txt into your tmp 
directory. Try again and attach the results to this ticket.

This is also probably the same issue as Bug: 12259

What about the subfolders?
Yes, because they get a new UID when they are (re)added to the folder 
and the UID is higher than the minimum UID initially synched. 
Currently the date is only used to filter on the initial sync - it's 
not filtered for newly arriving messages after the initial pairing - 
the thought being even if it's dated in the past, if it's new to the 
mailbox the user will probably want to see it in the pushed mailboxes. 
I'm not sure if that's the correct thing to do though to be honest.

Does anyone know what Exchange does in the instance? I can't find any 
thing pertaining to this in the protocol docs. I'll probably look at 
this more closely when I finally implement SOFTDELETE (which usually 
runs once per day and removes items as they age and fall outside of 
the filter window).

I don't think so. Looks like a different issue.

Do you have the synlog portion showing the FOLDERSYNC? I want to see 
if the correct folder structure is being sent to the device.

Probably Bug #12339

I moved all of the emails out of the user/chiarina folder, and the 
folder sync'ed successfully. Put them all back and it sync'ed again 
successfully, picking up a new email.

Interestingly, ALL emails in the folder now sync to the device, 
regardless of the "sync 1 month" setting - I assume becaue they are 
now seen as new in the folder? They date back a year....

IMAP debug log attached.

It's retrieving the list of emails in the mailbox fine, and also notes 
the subfolders.

But they never reach the device.

Other folders appear fine on the S4, just this one for some reason...

After a few days now, it appears to have *mostly* settled down, apart 
from one issue which I will outline here.

The server is back on AS 14.1, and two devices have been removed and 
re-added so are syncing with 14.1. 4 other devices are still 12.1.

CPU usage, retries, battery life have all stabilised, so I have no 
idea what the issue was when I first upgraded to 5.1, but I think it 
has mostly gone.

*Remaining Issue*
I have two devices under my logon, an iPad running iOS 6.1.3, and an 
S4 running android 4.2.2. Both are connected with 14.1.

The S4 cannot read a particular folder (user/chiarina). The iPad reads 
it fine. There are other similar folders that the S4 reads fine (e.g. 
user/benjamin), with its subfolders.

There are 53 messages in the user/chiarina folder, and only 1 of them 
sits within the 1 month sync period. The folder has subfolders.

The iPad correctly reads the folder, picking up the 1 email, and also 
shows me the subfolders that are available.

The S4 does not. A sync shows empty folder, and selecting folders it 
shows the folder as selectable, but with no subfolders.

I have attached the S4 device log from an attempted device-originated 
refresh in the folder, and the IMAP debug log from the same 
transaction will be in the next comment. The device log shows the same 
ERR: Unknown message error that was cropping up when I first upgraded 
as noted in previous comments.

An IMAP reconstruct on the folder does not help.

Something in this folder is causing AS to completely abort the folder sync...

Hmmm.... it started doing repeated checks every 2 or 3 seconds again 
late yesterday, on all devices. This morning it was hammering away 
chewing client battery and server resources again.

Then 8 hours ago (lunchtime here) I did two things to the system:

1. Made a change that Michael S had git committed to 
horde/imp/lib/Mime/Viewer/Pgp.php to resolve a php 5.3.3 issue causing 
failures in verifying pgp signed emails;
2. pecl uninstall apc - I had been getting lots of PHP Fatal error:   
Base lambda function for closure not found in 
/var/www/horde/imp/config/prefs.php in the httpd log, even though not 
using APC, so uninstalled it (which made those errors go away).

I restarted httpd, and the system has been running flawlessly for 8 
hours. Go figure...

The last ERR: Unknown message notification occurred before the changes.

There have been no issues with AS at all since then, no unexpected 
initial syncs, no retries, no ERRs.

I will see how it goes over the next few days.

This log starts with the client asking the server for an initial sync. 
If it was due to something the server did, it would have happened 
prior to the beginning of the log. Otherwise, it's the client deciding 
to start a new sync for some reason. Though, again, I have not seen 
this.
FWIW, 14.1 works well on my iOS devices.

This is normal when your IMAP server does not support both of those 
IMAP extensions.
This is coming from the IMAP server. No idea why though, as I don't 
see this under normal usage.

OK, back on AS12.1 for most of today and stability is good.

None of the devices are doing the looping checks, nor do they appear 
to be getting stuck on anything, even though I am still seeing the no 
condstore modseq messages, and occasionally the ERR message - e.g.:

2013-06-08T12:34:47+00:00 INFO: NO CONDSTORE or per mailbox MODSEQ: 
minuid=10903
2013-06-08T12:34:48+00:00 ERR: Unknown message.

It just seems to continue anyway.


Still one issue though!

What has happened twice on one iPad is that checking for new emails in 
my Inbox has initiated an Initial Sync, instead of just an update.

I have attached a log of that where I have fired up the iPad, checked 
for email, and it has caused an initial sync, thus briefly emptying 
all emails from the inbox on the ipad before re-syncing.


I'd like to go back to 14.1 at some point - the notification of 
replied to emails is great... but at least on AS12.1 it's all mostly 
stable.

Interesting... I dropped AS back to 12.1, and removed accounts on 4 
devices, and re-added.

The constant retries appear to have stopped.

The messages about NO CONDSTORE or per mailbox MODSEQ: minuid=48791 
etc still appear, and even with what appear to be less ERR messages 
after them, but the devices have massively dropped comms to the 
server, and log files are back under control. The email client on iPad 
no longr keeps spinning "Checking for mail..." / stop / "Checking for 
mail..." etc.

My wife's iPad has gone back to just doing this every 30 seconds as expected:

2013-06-08T17:32:14+10:00 INFO: [21182] Sleeping for 30 seconds.
2013-06-08T17:32:44+10:00 INFO: [21182] SyncCache collections refreshed.
2013-06-08T17:32:44+10:00 INFO: [21182] Refreshing 0d2d7ffd from the cache.
2013-06-08T17:32:44+10:00 INFO: [21182] Refreshing @Calendar@ from the cache.
2013-06-08T17:32:44+10:00 INFO: [21182] Refreshing @Contacts@ from the cache.
2013-06-08T17:32:44+10:00 INFO: [21182] Refreshing @Tasks@ from the cache.
2013-06-08T17:32:44+10:00 INFO: [21182] Initializing state for 
collection: INBOX, synckey: {51b2b3f6-65bc-4bf9-84f9-0da3c0a801e6}45
2013-06-08T17:32:44+10:00 INFO: [21182] Loading state for synckey 
{51b2b3f6-65bc-4bf9-84f9-0da3c0a801e6}45
2013-06-08T17:32:44+10:00 INFO: [21182] Initializing message diff 
engine for 0d2d7ffd (INBOX)
2013-06-08T17:32:44+10:00 INFO: [21182] 
Horde_Core_ActiveSync_Driver::getServerChanges(INBOX, 1370676621, 
1370676764, 1370417564, 1)
2013-06-08T17:32:44+10:00 INFO: [21182] Found 0 message changes in 0d2d7ffd.
2013-06-08T17:32:44+10:00 INFO: [21182] Initializing state for 
collection: @Calendar@, synckey: {51b2b3f9-0728-44a2-a62d-0da4c0a801e6}3
2013-06-08T17:32:44+10:00 INFO: [21182] Loading state for synckey 
{51b2b3f9-0728-44a2-a62d-0da4c0a801e6}3
2013-06-08T17:32:44+10:00 INFO: [21182] Initializing message diff 
engine for @Calendar@ (@Calendar@)
2013-06-08T17:32:44+10:00 INFO: [21182] 
Horde_Core_ActiveSync_Driver::getServerChanges(@Calendar@, 1370665993, 
1370676764, 1368257564, 1)
2013-06-08T17:32:44+10:00 INFO: [21182] Found 0 message changes in @Calendar@.
2013-06-08T17:32:44+10:00 INFO: [21182] Initializing state for 
collection: @Contacts@, synckey: 
{51b2b3fa-6ac4-473e-b842-0da7c0a801e6}19
2013-06-08T17:32:44+10:00 INFO: [21182] Loading state for synckey 
{51b2b3fa-6ac4-473e-b842-0da7c0a801e6}19
2013-06-08T17:32:44+10:00 INFO: [21182] Initializing message diff 
engine for @Contacts@ (@Contacts@)
2013-06-08T17:32:44+10:00 INFO: [21182] 
Horde_Core_ActiveSync_Driver::getServerChanges(@Contacts@, 1370666050, 
1370676764, 0, 1)
2013-06-08T17:32:44+10:00 INFO: [21182] Found 0 message changes in @Contacts@.
2013-06-08T17:32:44+10:00 INFO: [21182] Initializing state for 
collection: @Tasks@, synckey: {51b2b404-8930-4f89-b11e-0da7c0a801e6}1
2013-06-08T17:32:44+10:00 INFO: [21182] Loading state for synckey 
{51b2b404-8930-4f89-b11e-0da7c0a801e6}1
2013-06-08T17:32:44+10:00 INFO: [21182] Initializing message diff 
engine for @Tasks@ (@Tasks@)
2013-06-08T17:32:44+10:00 INFO: [21182] 
Horde_Core_ActiveSync_Driver::getServerChanges(@Tasks@, 0, 1370676764, 
0, 1)
2013-06-08T17:32:44+10:00 INFO: [21182] Found 0 message changes in @Tasks@.
2013-06-08T17:32:44+10:00 INFO: [21182] Sleeping for 30 seconds.

I have had it happen in Sent, Inbox, the Horde mailing list folder... 
i.e. any folder that I have been into and 'requested' a sync. The 
Horde folder is the one yes that had the other issue, but this is not 
confined to that folder.
My wife's iPad has logged 500MB into the device log overnight with retries.
The emails in question are all fine and can be read in any other IMAP 
client I have tried, including Imp. I have run reconstruct on the 
folders, makes no difference.

Needless to say, I can't reproduce this. Even with your provided 
email.  From the log, it seems as though your IMAP server can't find 
the email that is being requested. Is this the same mailbox you were 
having trouble with in the "deep folder structure" ticket?

More info. It is happening on my Android phone too, but it just 
doesn't go mental re-checking it every 2 seconds like iOS is. My Horde 
mailing list folder is jamming up on an email from May, on both my 
iPad and my S4. Same email, result is that on iPad it goes into its 
crazy re-check/ log loop. On android the folder just doesn't 
successfully update, and hasn't since about 11am when I upgraded Horde 
to 5.1 and AS 14.1.

I can confirm that this is now happening on all of our iOS devices, 
including my iPad that has been on AS email for months, so it doesn't 
appear to be account related or to the fact that I have today moved my 
wife's iPad to AS email from IMAP. For my wife's two devices, it is 
the same email that is triggering it on each at 12 days old (attached).

System changes made today are the upgrade to 5.1.0 (+ all apps) and 
config change to AS 14.1. It has not been happening prior to these 
changes (device log sizes this morning when I started upgrades were 
small).

Happening again. Each time it does it it's with the oldest email 
appearing on the iPad (it's set to show 2 weeks, and the triggering 
email is the oldest one that should appear at 12 days old). It's 
causing rapid battery drain on the iPad, and Horde AS device log for 
this iPad that has had 4 triggers is 115MB since I logged this bug 4 
hours ago. The other iPad log is 40MB from 1 triggering email in the 
same time.

Did it again 10 minutes later on another email, that's the third one.

I can recover that one too if it helps.

It's a crap email, just one of those 'oh this is lovely' types...

I have finally moved my wife's iPad over from IMAP to Horde ActiveSync 
for emails, but am running into an issue -

It is constantly looping and re-checking for mail, about every 2.5 seconds.

I have attached a device log that hows the sequence. It appears to be 
getting hung up on a particular email, 10764.

After deleting it from Imp, the device continues to try and try, 
blocking on the same errors. Reboot the device, and it comes back into 
the same sequence of errors.

Change the time period on the device to force a reset breaks the cycle.

I have run reconstruct on the mailbox, and will attach the email in 
question in a comment to follow.