Many of the business organizations I work with are getting their IT Pros involved in Private Cloud data center virtualization initiatives to gain more business value and lower costs than with straight server workload virtualization alone. This may be one of the reasons that Data Center Virtualization is in the Top 10.
If you're in a Microsoft shop, you can prepare for certification on the new Microsoft MCSE: Private Cloud certification by leveraging the free study resources and software at http://aka.ms/studyguides.
Hope this helps!
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