Horde_ActiveSync-2.13.3 is out.

Sorry for the recent issues all....

See http://bugs.horde.org/ticket/13052#c6

Running a last "the new release doesn't blow up my computer" test as we speak.

OK, I see now what you are saying.  Is there a fix being contemplated/needed?

If the device was paired while running 2.12.4 (and therefore 
negotiated EAS version 12.x), it will continue to work under that 
version until it is told otherwise.

The device isn't using EAS 12.1, Horde is using EAS 14.1. This will 
work as long as Horde is not using something that wasn't available in 
EAS 12.1. But as soon as it does, synchronization will break again.

Hmmm, then why is the same device using EAS 14.1 and now syncing just 
fine under ActiveSync v2.13.2?  Recall from my previous post that once 
I downgraded to 2.12.4, then manuall sync'd the device, then upgraded 
to 2.13.2, the device works just fine.  Doesn't seem right somehow.

The device uses EAS 12.1 and therefor will not work with the 
Horde_ActiveSync-2.13.2. So yes, if you revert this commit, it will 
most likely work if it worked with Horde_ActiveSync-2.12.4.

The log file I posted contains entries while running under 2.13.2 and 
2.12.4.  The 2.12.4 entry shows the following:

equest being handled for device: ANDROIDC135954261, Supporting 
protocol version: 12.1, Using Horde_ActiveSync v2.12.4

The 2.13.2 entry shows the following:

Request being handled for device: ANDROIDC135954261, Supporting 
protocol version: 14.1, Using Horde_ActiveSync v2.13.2

I'm not familiar with the Moto X, but since it's a fairly recent 
device I would imagine it uses EAS 14.1? Can you look at your logs 
when using 2.12.4 and see what the initial log entry says about the 
EAS version in  use?

Hard to say, as your log doesn't really show any thing to indicate an 
error. If this is an older device that can only talk a version less 
than 14.1, then it will likely help.

http://article.gmane.org/gmane.comp.horde.user/34712

Maybe this fix my issue as well?

You're right, this errors happens only with 2.12.4, not with 2.13.2.
Send you today my debug log by mail.

Perhaps you can delete the attachment from the ticket once you've 
grabbed it as well.

See attached log.  Includes error when running 2.13.2 and proper sync 
once downgraded to 2.12.4.  Note that once I downgraded to 2.12.4 and 
synced the email accounts on the device manually, then upgraded to 
2.13.2, the device sync'd just fine.  However, since I don't have 
control over my email users devices, I'm downgrading back to 2.12.4 
since I know it "just works."

I'm going to need a full synclog to see where this is failing.

I can confirm that ActiveSync-2.13.1 and ActiveSync-2.13.2 do break 
sync on Android MOTO1080X.  Still works on Nexus 7 gen. 2.  Downgrade 
to ActiveSync-2.12.4 and all is working again on MOTO1080X.

Work for some mails now and stop again:
2014-03-13T14:41:03+00:00 NOTICE: [4077] Error saving state for 
synckey {5320712f-xxxx-xxxx-xxxx-xxxxxxxxxxxx}42: QUERY FAILED: 
Duplicate entry '{5320712f-xxxx-xxxx-xxxx-xxxxxxxxxxxx}42' for key 
'PRIMARY' INSERT INTO horde_activesync_state (sync_key, sync_data, 
sync_devid, sync_mod, sync_folderid, sync_user, sync_pending, 
sync_timestamp) VALUES [...]
Is it a way to delete all AS database entries for my user, if yes which?

Yes.
Possible. It would have caused a bunch of old processes to hang around 
for a while, possibly corrupting some state.

You mean this error was from 2.12.4? Possible and I do not noticed 
when i am testing between 2.12.4 and 2.13.1. Anyway, at the moment I 
do not see any errors after update to Horde_ActiveSync-2.13.2.
Watch it now for some hours and give you a feedback.

Maybe this fix my issue as well?
https://github.com/horde/horde/commit/1288a7436ba2d95159814f04e3c69264d5fa319e

[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP Fatal
error:  [] operator not supported for strings in
/usr/share/php/Horde/ActiveSync/Folder/Imap.php on line 222

This line number only contains a [] operator in version 2.12.4. Do you 
see any errors when running it under the current version?

Probably related to adding sequence string storage:

https://github.com/horde/horde/commit/8bc8f6433f808c5761bee3d609d230daf4281f23

Will take a look as soon as I'm able.

I have tried:
* reset the device in horde
* delete the device in horde
* remove the as account on the smartphone and delete it in horde
* downgrade to Horde_ActiveSync-2.12.4, restore database (2.12.4), 
sync device and upgrade direct to Horde_ActiveSync-2.13.1 same problem

Did you try to resynchronize devices? That's when the problems started 
for me. When a device is already synchronized, upgrading to 
Horde_ActiveSync-2.13.1 doesn't seem to break existing (synchronized) 
accounts. But as soon as a device is resynchronized, problems start.

I move all messages into a other folder, only one message is in the 
inbox, same problem.
At the moment only on device is affected, the other work as expected.

I see the same behavior here, but with a different mailbox. My guess 
is that you have a fair number of message in you Inbox, since here the 
mailbox that loses synchronization is the one with the most messages 
in it (over 500 messages).

It may or may not have something to do with this, but synchronization 
of the calendar also failed when resynchronizing the device. 
Downgrading to Horde_ActiveSync-2.12.4 resolved both the mailbox and 
calendar synchronization issues.

My Android 4.1.2 device stop synchronize my mail Inbox with 
Horde_ActiveSync-2.13.1, other Mailfolders work fine. Reset the device 
does not help.

Horde Log:
2014-03-12T04:14:53+00:00 INFO: [25603] Updating state during change
2014-03-12T04:14:53+00:00 DEBUG: [25603] O     </Commands>
2014-03-12T04:14:53+00:00 INFO: [25603] Saving state: 
a:8:{i:0;s:39:"{531fddad-xxxx-xxxx-xxxx-xxxxxxxxxxxx}5";i:1;O:21:"Horde_Db_Value_Binary":1:{s:5:"value";s:206:"C:28:"Horde_ActiveSync_Folder_Imap":164:{{"s":{"messages":"1","uidnext":"5378","uidvalidity":"1342278888","highestmodseq":"12679"},"m":"5377","f":"INBOX","c":"Email","lsd":1393992593,"sd":1394597393,"v":2}}";}i:2;s:17:"ANDROID1xxxx";i:3;i:1394597693;i:4;s:9:"F3ef80eea";i:5;s:6:"samuel";i:6;i:0;i:7;i:1394597693;}
2014-03-12T04:14:53+00:00 NOTICE: [25603] Error saving state for 
synckey {531fddad-xxxx-xxxx-xxxx-xxxxxxxxxxxx}5: QUERY FAILED: 
Duplicate entry '{531fddad-xxxx-xxxx-xxxx-xxxxxxxxxxxx}5' for key 
'PRIMARY'

INSERT INTO horde_activesync_state (sync_key, sync_data, sync_devid, 
sync_mod, sync_folderid, sync_user, sync_pending, sync_timestamp) 
VALUES ('{531fddad-xxxx-xxxx-xxxx-xxxxxxxxxxxx}5', 
'C:28:"Horde_ActiveSync_Folder_Imap":164:{{"s":{"messages":"1","uidnext":"5378","uidvalidity":"1342278888","highestmodseq":"12679"},"m":"5377","f":"INBOX","c":"Email","lsd":1393992593,"sd":1394597393,"v":2}}', 'ANDROID1xxxx', 1394597693, 'F3ef80eea', 'samuel', 'a:0:{}', 1394597693) - removing previous sync state and trying 
again.
2014-03-12T04:14:53+00:00 DEBUG: [25603] O    </Folder>
2014-03-12T04:14:53+00:00 DEBUG: [25603] O   </Folders>
2014-03-12T04:14:53+00:00 DEBUG: [25603] O  </Synchronize>

Found some errors in the apache log:
[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP Fatal 
error:  [] operator not supported for strings in 
/usr/share/php/Horde/ActiveSync/Folder/Imap.php on line 222
[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP Stack trace:
[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP   1. 
{main}() /var/www/https/horde/rpc.php:0
[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP   2. 
Horde_Rpc_ActiveSync->getResponse() /var/www/https/horde/rpc.php:156
[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP   3. 
Horde_ActiveSync->handleRequest() 
/usr/share/php/Horde/Rpc/ActiveSync.php:143
[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP   4. 
Horde_ActiveSync_Request_Base->handle() 
/usr/share/php/Horde/ActiveSync.php:897
[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP   5. 
Horde_ActiveSync_Request_Sync->_handle() 
/usr/share/php/Horde/ActiveSync/Request/Base.php:249
[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP   6. 
Horde_ActiveSync_Collections->getCollectionChangeCount() 
/usr/share/php/Horde/ActiveSync/Request/Sync.php:399
[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP   7. 
Horde_ActiveSync_Collections->getCollectionChanges() 
/usr/share/php/Horde/ActiveSync/Collections.php:1216
[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP   8. 
Horde_ActiveSync_State_Base->getChanges() 
/usr/share/php/Horde/ActiveSync/Collections.php:1180
[Wed Mar 12 05:29:28 2014] [error] [client 93.201.xx.xx] PHP   9. 
Horde_ActiveSync_Folder_Imap->updateState() 
/usr/share/php/Horde/ActiveSync/State/Base.php:445

Downgrade to Horde_ActiveSync-2.12.4 help.
php5 5.4.4-14+deb7u8
Horde_Mime                2.3.0   stable
Horde_Imap_Client         2.19.0  stable