O365 OWA & Outlook 2010/13 shared mailbox - duplicates when moving items

Hi Support
I have been directed to ask this question in the IT Pro forum.
Previous thread:
http://community.office365.com/en-us/f/158/p/281263/859737.aspx#859737
Issue: I have noticed an issue whereby a duplicate mail item is created when a mailbox is shared between 2x users and the users move mail items at the same time (or within a short period (say 30seconds) before the next sync). Both users have the O365
email account programmed directly into their Outlook (not using sharing permissions).
Replicated issue: If user1 moves a mail item from say the inbox to a folder, then (within 30-60seconds) user2 also moves that same mail item from the inbox item to another folder (before the sync of user1's actions show up on user2's Outlook),
then a duplicate of the email is created in both folders. I can replicate this issue in O365 OWA, Outlook 2010, Outlook 2013 and on different O365 tenancies.
So my questions are:
1. Is this is a limitation of Outlook/O365 sync capability?
2. What would be the best option to stop this from occurring, assuming both users need to access the same email information?
What do you guys think?
Kind Regards
Aaron

Hi,
Another reference point...
When to use Online Mode
Online Mode is the legacy method of connecting to Microsoft Exchange. It is a fully supported configuration in Office Outlook 2003, Outlook 2007, and Outlook 2010. Online Mode has value in certain scenarios in which the behavior of Cached Exchange Mode is
unwanted. Example scenarios include the following:
“Kiosk” scenarios in which a particular computer has many users who access different Outlook accounts and the delay to download e-mail messages to a local cache is unacceptable.
Heavily regulated compliance or secure environments in which data must not be stored locally for any reason. In these environments, we recommend that you evaluate Encrypting File System (EFS) or BitLocker in addition to Cached Exchange Mode as a potential
solution.
Very large mailboxes on computers that do not have enough hard disk space for a local copy of the mailbox.
Very large mailboxes (greater than 25 GB) on which performance considerations become an issue in Cached Exchange Mode.
Virtualized or Remote Desktop Services (Terminal Services) environments that run Outlook 2007 or Outlook 2003. Cached Exchange Mode is not supported when you run Outlook 2007 or Outlook 2003 on a computer running Remote Desktop Services (Terminal
Services).
Virtualized or Remote Desktop Services (Terminal Services) environments that run Outlook 2010 on which disk size or disk input/output (I/O) limitations prevent running Cached Exchange Mode at the desired scale.
If you work with a very large mailbox, you can reduce the size of the local data file by using synchronization filters. For more information, see
Create a synchronization filter (http://go.microsoft.com/fwlink/p/?LinkID=193917) and
Optimizing Outlook 2007 Cache Mode Performance for a Very Large Mailbox (http://go.microsoft.com/fwlink/p/?LinkID=193918).
If you work with a very large mailbox on which performance considerations become an issue in Cached Exchange Mode, see
How to troubleshoot performance issues in Outlook (http://go.microsoft.com/fwlink/p/?LinkID=193920).
Thanks & Regards
John Chris

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After searching this forum and many other forums online, I have decided to ask my question here as I cannot find a solution.
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Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
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O365 OWA & Outlook 2010/13 shared mailbox - duplicates when moving items

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