[horde] Can't synchronize older devices with ActiveSync-2.13.2

[Arjen de Korte]

I have several (older) devices that stop synchronizing with the latest  
(2.13.2) version of Horde_ActiveSync. Calendar synchronization has  
been broken for most of them (and the newer ones too) for quite a  
while already (see Bug #13022), but now also mailboxes are affected.  
Some mailboxes will synchronize fine, but others (it seems to be the  
ones with lots of messages in them) don't. Removing accounts and  
provisioning devices again doesn't help.

One thing that I noticed is, that now all devices report the same  
'Supporting protocol version':

INFO: [5891] Request being handled for device: HTCAND543813B4,  
Supporting protocol version: 14,1, Using Horde_ActiveSync v2.13.2
INFO: [5207] Request being handled for device: 847CC7DCA0F0B1CF,  
Supporting protocol version: 14.1, Using Horde_ActiveSync v2.13.2
INFO: [7820] Request being handled for device: ANDROID1325376003651,  
Supporting protocol version: 14.1, Using Horde_ActiveSync v2.13.2

The last version of Horde_ActiveSync that more-or-less works here is  
2.12.4, where the supporting protocol version matches with what the  
devices actually support:

INFO: [19415] Request being handled for device: HTCAND543813B4,  
Supporting protocol version: 12.1, Using Horde_ActiveSync v2.12.4
INFO: [20366] Request being handled for device: 847CC7DCA0F0B1CF,  
Supporting protocol version: 12.1, Using Horde_ActiveSync v2.12.4
INFO: [26236] Request being handled for device: ANDROID1325376003651,  
Supporting protocol version: 14.1, Using Horde_ActiveSync v2.12.4

Only the ANDROID1325376003651 is able to synchronize mail without  
issues, for the other two there will be massive looping syncs before  
Horde gives up on synchronization (large mailboxes and the calendar  
seem to be affected). With v2.12.4 all devices synchronize at least  
mail and contacts properly and some accounts (this doesn't seem to be  
related to the devices) will also have their calendar synchronized.
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