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Once you have vCenter and Update Manager upgraded and configured for use, the ESXi host upgrades can be performed using VUM in a much more effective manner. You will be able to run the upgrades simultaneously on more than one ESXi host using VUM remediation. You will learn more about this in Chapter 14, Upgrading and Patching using vSphere Update Manager.
It is important to note that although there are means to retain your Microsoft Windows servers to run the vCenter components, there is no longer a compelling reason to do so. The vCenter Server Appliance is the way ahead, and you need not be surprised to see VMware completely removing the dependency on Microsoft OS or external databases in its future releases.