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Two emails receiving the same Message ID

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http://serverfault.com – A user is experiencing a problem whereby when sending emails, some emails are being allocated the same Message ID. The issue looks to occur when the user has a draft email and they forward the draft to one person, and then later send the draft to another person. I have done an email trace in Exchange, searching only on Message ID and Exchange is returning the two emails. Our environment is Outlook 2010 SP1, Exchange 2010 + Exchange 2007, our users run in Outlook Cache Mode. I have done some research and from what I have read it is the client which generates the Message ID, is this correct? (HowTos)