Mail 4.1, Exchange, and Duplicate messages in inbox

Using Snow Leopard and Mail 4.1 to access an exchange account and a gmail account. The problem ONLY occurs in the Exchange account. My messages are all duplicating. Only in Mail are they duplicating. I've checked Outlook Web Access and Outlook on my windows machine - no duplicates there. Didn't start out this way, and the problem came once before, stopped, and now it has returned. If I delete one copy of the message, both messages get deleted. Is there someway to rebuild the mail inbox? or resync?
Also, tried creating a new folder on the exchange server, copying all messages from inbox to the new folder, then moving back. In the temp/new folder, the messages were single. After copying back to Inbox - they doubled again. And again, only in Mail. The msgs remain single in Outlook, OWA, iPhone, Blackberry.
UPDATE: I highlighted the exchange mailbox and went to MAILBOX > REBUILD. Erased everything but only in Mail. The messages are still on the Exchange server and can be seen by OWA, Outlook, iphone and blackberry. New messages are going to the Mail Exchange inbox but old messages are gone. Any way to get them back?
Message was edited by: Atlantax

FromBone wrote:
Thanks V.K.! So there is no chance for me to re upload all the messages from my mac to my yahoo inbox.
nope.
May I ask yahoo to that?
you can ask but they won't say anything different.
I could never have known that the default setting on mac's mail would be "remove copy from server after retrieving a message".
now, that's a valid point. this is not exactly advertised and mail setup assistant does not tell you anything about it. you can voice your concern to apple about this issue here
http://www.apple.com/feedback/macosx.html
I wish apple had some kind of a solution for this.
there isn't anything you can do now. it's not up to apple at this point. you just can't upload messages to a POP email server. it does not matter what email client or what operating system you are using.
Thanks again

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I am trying to resend an email from my spam firewall but it is not reaching the user. The duplication detection on the server is not allowing me to resend. If I go back older than a month I was able to successfully resend from the spam firewall.
How do I temporally disable the duplicate message detection on Exchange 2013 server?
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After some search, I think we can adjust the expiration time of duplicate message detection. And the minimum value is 1 hour, so we don't need to wait several days.
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please refer to these articles:
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http://technet.microsoft.com/en-us/library/dd577073(v=exchg.80).aspx

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If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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I found some article in Apple support with the following details. I tried both the options and it doesn't work either. More info here http://docs.info.apple.com/article.html?path=Mail/2.0/en/ml1002.html
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Message was edited by: Santhosh Paramesh

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Barry,
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Mail 4.1, Exchange, and Duplicate messages in inbox

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