[sync] Messages duplicating upon move

[Michael J Rubinsky]

Quoting Ivan kouvykov <ivan at kouvykov.com>:

> When moving message from one folder to another in Outlook 2013 x64 a
> duplicate is created in destination folder.

This appears to be a bug in Outlook.  When a message is moved using  
ActiveSync the following should happen:

1) Client is asked to move a message.

2) Client sends a MoveItems request.

3) Client receives MoveItems response with a success code, along with  
the UID of the new item in the destination folder.

4) Client deletes item from destination folder.

5) On the next SYNC request, the client receives the ADD command for  
the "new" item in the destination folder (if it is a pushed folder)  
and adds the item to the folder.

What Outlook is doing (and I verified this locally), is between step 4  
and 5 Outlook is also moving the message from the src to dest locally.  
You can verify this by watching the sync log and immediately switching  
switching Outlook to view the destination folder. The item is already  
in the destination folder *before* the ADD command is sent to Outlook.

While the specs only say that the client should update the destination  
folder using the ADD command in the next SYNC request, I imagine that  
since the message id is returned in the MoveItems response, that if  
the client chooses to display the moved email in the destination  
folder immediately, it should use the message id received in the  
MoveItems response to know not to add the duplicate message.

Additionally, deleting the copy of the email that Outlook moved does  
not send any delete command to the activesync server, while deleting  
the copy that appeared after the ADD command returned *will* send the  
delete command. The is further evidence that the initial message is  
put there by Outlook, not by ActiveSync and this is a violation of the  
spec.
-- 
mike

The Horde Project (www.horde.org)
mrubinsk at horde.org
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