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Tyson Kopczynski

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Duplicate Message Detection bug in Exchange Server 2010 RU 1 and greater…

Learning about and understanding the Duplicate Message Detection bug in Exchange Server 2010

By tyson.kopczynski on Wed, 06/09/10 - 5:02pm.

. What's this?

In case anyone encounters this, a customer of ours brought this to our attention. Basically, Exchange Server 2010 RU 1 or greater introduced a very odd Duplicate Message Detection bug. You encounter the bug when a delegate receives the same meeting request on behalf of the delegator and to themselves. Instead of two meeting requests for the delegate to respond to in their in-box, there is only the one sent to the delegate. Additionally, if the delegate has two different delegators and both delegators are invited to the same message. The delegate will receive only one meeting request which is randomly for either delegator.

Apparently per this posting on the Exchange forums there are some other scenarios where this bug is encountered: http://social.technet.microsoft.com/Forums/en-GB/exchange2010/thread/a717020c-1deb-4d76-8697-ac5f886ebdeb. Basically, the bug is an issue with the “Duplicate Message Detection” feature on the Store Driver. In the posting, MSFT says that this bug is only encountered when after installing RU 1 and will be addressed by a later roll up or SP1. However, I’ve tested just applying RU 3 and (as one would expect) the bug is still there.

So… if you see this one… do not panic. While the issue is kinda of a big issue that will most likely impact the big wigs, the Exchange product team is aware of the issue and will fix it at some later date. Oh wait… maybe we should panic…

If you like this, check out some other posts from Tyson:

Or if you want, you can also check out some of Tyson's latest publications:

Windows PowerShell Unleashed (2^ndEdition)
Windows Server 2008 Unleashed (Yes, I did help on this book)

Lastly, visit the Microsoft Subnet for more news, blogs, and opinions from around the Internet. Or, sign up for the bi-weekly Microsoft newsletter. (Click on News/Microsoft News Alert)

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About Hidden Microsoft

With more than ten years of experience in IT, Tyson Kopczynski has become a specialist in Active Directory, Information Assurance, Windows automation, PKI, and IT security practices. Tyson is also the founding author of the Windows PowerShell Unleashed series and has been a contributing author for such books as Microsoft Internet Security and Acceleration (ISA) Server 2006 Unleashed and Microsoft Windows Server 2008 R2 Unleashed. He has also written many detailed technical papers and guides covering various technologies. As a consultant at Convergent Computing, Tyson works with and provides feedback for next generation Microsoft technologies since their inception and has also played a key role in expanding the automation and security practices at CCO. Tyson also holds such certifications as the Certified Information Systems Security Professional (CISSP), the SANS Security Essentials Certification (GSEC) and SANS Certified Incident Handler (GCIH), and the MCTS (Application Platform, Active Directory, and Network Infrastructure).

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