[Tickets #12945] Re: ActiveSync: Deleting one email in Outlook 2013 results in two mails in Outlook 2013 trash folder

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Ticket URL: http://bugs.horde.org/ticket/12945
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  Ticket             | 12945
  Updated By         | Michael Rubinsky <mrubinsk at horde.org>
  Summary            | ActiveSync: Deleting one email in Outlook 2013 results
                     | in two mails in Outlook 2013 trash folder
  Queue              | Synchronization
  Version            | Git master
  Type               | Bug
-State              | Unconfirmed
+State              | Not A Bug
  Priority           | 1. Low
  Milestone          |
  Patch              |
-Owners             |
+Owners             | Michael Rubinsky
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Michael Rubinsky <mrubinsk at horde.org> (2014-01-30 15:03) wrote:

> Hello,
>
> I experienced a litte bug when using Outlook 2013 via ActiveSync to   
> connect to Horde.
> When I delete an email in Outlook 2013, it is moved to the trash  
> folder correctly. After a few seconds exactly the same email appears  
>  in the trash folder, so you now see the deleted email twice.
> This second email appears only in Outlook, you don't see it in the  
> Horde webmail trash.

This is a known issue. OL is sending a MOVE command to move the email  
to the trash folder (which is correct), but it ALSO manually moves the  
email locally (this is incorrect). All the client is supposed to do is  
remove the email from the old mailbox. The server, in response to the  
MOVE command moves the email to the new folder (In this case the Trash  
folder) and the change is then picked up on the next SYNC or PING  
cycle. SInce OL is manually moving the email, the server has no idea  
it is already in the mailbox (the protocol provides no mechanism for  
this, all changes are done server side and sent to the client).

> If you compare the header of the two emails, it slightly differs in   
> the "Content-Type" field, everything else is exactly the same.
>
> Deleted email:
> Content-Type: multipart/alternative; boundary="=_7CrMzMy6GwiFZgAVh3gsUw9"
>
> Email which appeared some seconds later:
> Content-Type: multipart/alternative; boundary="=_yt_nh4i36nWWv2czhvKVfQ1"
>
> It seems as when the deleted email is synced to Horde it's header  
> gets changed, so Outlook 2013 sees it as a new item and downloads it  
> again.

No. This is not how sync works. The client doesn't "download" an email  
based on any criteria. The server knows what messages were sent to the  
client based on the message's UID, not any other header values and  
detects any changes in the mailboxes on the IMAP server. These changes  
are sent to the client. Any client initiated changes are sent as  
commands to the server, i.e., "move this message from the INBOX to the  
Trash folder please". The server performs the command and tells the  
client the results, i.e., "I moved the email from the INBOX to the  
Trash folder and it has the following UID value: 432. You should  
remove the old copy of the email from the INBOX folder."

> If you need any further information please don't hesitate to contact me!
>
> Best regards,
> Christian Hailer