Receiving Duplicate emails on shared Mailbox

We are using Exchange Server 2007 and outlook client is Outlook 2010.
We are not using PST concepts(that is mails downloaded to local copy and remove from the Server).
one of the shared mailbox is accessed by many people and they are receiving duplicate emails frequently on the shared mailbox.
Is there any solution to stop receiving duplicate email.

Hi,
Agree with Willard. Please check if these duplicate messages have the same Message ID.
If they are sent separately, we can't stop this. If they have the same Message ID, please check whether there is corrupted rules in Outlook.
Besides, please check if there is any third party add-ins from Outlook user side. If the shared mailbox is accessed by 5 users, then we need to disable add-ins on these 5 users' Outlook client.
Best regards,
Belinda
Belinda Ma
TechNet Community Support

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Hi Guys,
We have a shared mailbox and is accessed by more than 5 users.
Some one did something and the emails got deleted. I see them in recoverable deleted items folder.
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FYI - we do not have auditing enabled on this mailbox prior to deletion.
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Hello,
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Mailbox audit logging
https://technet.microsoft.com/en-us/library/ff459237(v=exchg.150).aspx
Thanks,
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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TechNet Community Support

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Receiving Duplicate emails on shared Mailbox

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