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Daniel Petri: Hyper-V, as you probably know by now, is being introduced more and more as a virtualization host (a "host" is a physical computer/server that runs a virtualization product, and which is used to run multiple virtual machines, also called "guests"). Because Hyper-V is based on a Windows 2008/R2 operating system, we need to pay close attention to the patches, bug fixes, security fixes and critical updates that are released by Microsoft. Also remember that patches and updates can come from any number of software products (and not just Microsoft), software products such as backup agents, drivers and firmware, as well as management, monitoring and anti-virus software.