http://www.microsoft.com/technet/prodtechnol/scp/opsmgr07.aspx?SCPProdID=3 This is a pretty major update - and it looks to address the biggest issues with the Exchange 2003 MP.... most notably reducing Self Tuning Threshold noise
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Read the complete post at http://blogs.technet.com/kevinholman/archive/2008/08/22/updated-exchange-2003-mp-released-version-6-0-6387-0.aspx