Not much has changed when upgrading from Operations Manager 2007 SP1 to R2 or deploying a fresh installation of Operations Manager 2007 R2. However, I do want to take the opportunity to point out few of the changes. Changes to supported platforms Operations
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Read the complete post at http://blogs.technet.com/momteam/archive/2009/05/29/what-s-new-in-r2-deployment-and-upgrade.aspx