Essentials 2010 is licensed per device. Only physical computers consume server or client management licenses and are required to have a license. However, Essentials is limited to managing up to 50 server operating system environments and 500 client
operating system environments. For example, you might have purchased licenses to manage 20 physical servers, are managing all 20 physical servers, and are also managing 30 virtual servers. Because you are managing 50 server operating system environments, you
cannot manage any additional physical or virtual servers.
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