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From SQL Server Magazine]
Virtualization is certainly no stranger to the data center. Nowadays most companies use virtualization in some form another. Most companies use virtualization for test environments, and increasingly companies use virtualization for production-level server consolidation. Even though virtualization has been used for production workloads ranging from file serving to web hosting, theres one application that businesses have been slow to virtualizeSQL Server.
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http://www.sqlmag.com/Article/ArticleID/102784/sql_server_102784.html