[horde] Doubling emails-problem in Outlook 2013

[Patrick De Zordo]

Am 16.05.2014 16:13, schrieb Michael J Rubinsky:
>> Could it be possible (theoretical) to make some "if" or "case" 
>> instruction into the code to check if it is an OL client
>> and in case to omit the ADD command for the "new" item in the 
>> destination folder?
>
> Theoretically, sure. But that is NOT something we are going to do in 
> our code. There are already WAY too many workarounds in the code for 
> misbehaving clients that cause severe issues when they are not worked 
> around. This issue is an obvious bug in OL and an annoyance for the 
> users, but not something that would prevent the client from working or 
> something that would bring down the server due to tons of SYNC loops.
>

So what is MS Exchange server doing in this case?
Are they using some workarround probably, since there ActiveSync is 
working on OL and also in mobile clients.

>> The UID would not change in Outlook (so OL would have the old UID and 
>> the IMAP-Horde backend would have a new UID);
>> but it should not matter since Outlook "think" the self copied 
>> message is the moved message?
>
> This would mean that the client state is now inconsistent. The 
> ActiveSync server thinks an email with the new UID is on the client 
> (which, by the way would match the UID of the actual email on the IMAP 
> server). This now no longer matches the actual state of the client. 
> Any server side change to the email (like actually deleting it from 
> the IMAP server) will now NEVER make it to the client since the UIDs 
> are no longer the same. Likewise, no change to the email on the client 
> side (like, for instance trying to move it back to the INBOX) will 
> ever be accepted by the server. 

Agree, but what could you do for the "normal" moving of messages?
Our human clients (not OL ;-) ) are moving emails forwards and backwards 
and sort them with local rules, etc..
So they are making a lot of trouble in their messageboxes after some 
days.. I think you can understand this is a severe problem..