The operating system that runs on each role instance is known as the guest operating system. It includes settings for the ...

The operating system that runs on each role instance is known as the guest operating system. It includes settings for the operating system family and for the version. The operating system family is the type of Windows Server to use for the guest operating system. Each operating system family has multiple operating system versions. When you choose Automatic, the role instance will always use the most current version, and it will automatically update to new versions when they are released.