[Tickets #13985] Outlook 2013 clients showing duplicate emails

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Ticket URL: https://bugs.horde.org/ticket/13985
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  Ticket             | 13985
  Created By         | tim.odriscoll at lambrookschool.co.uk
  Summary            | Outlook 2013 clients showing duplicate emails
  Queue              | Synchronization
  Version            | FRAMEWORK_5_2
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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tim.odriscoll at lambrookschool.co.uk (2015-05-15 20:29) wrote:

Hello,
When Outlook 2013 is first started and starts syncing, some new emails  
are duplicated in the mailbox view. Mike's diagnosis:
It's related to the MOREAVAILABLE functionality. If you look at the  
group of messages the first time the message is sent, you'll see that  
it's the last 4 messages that are sent again in the following request  
that says it is sending messages remaining from the previous sync. For  
some reason, the state isn't being updated to reflect that it was  
already sent, or for some reason the message UID is returned twice  
from the IMAP server and we don't detect that.