Windows Server 2016 Administration Fundamentals

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Upgrade and migration overview (1.3.8)

Upgrade replaces your existing OS with a new one. This means that you retain your files and settings. This is often called an in-place upgrade because it happens in place on a machine with an OS already installed. It is recommended to make a backup of Windows state, files, and folders before running an upgrade. You can upgrade to Windows Server 2016 if your existing server runs Windows Server 2012 or Windows Server 2012 R2, but you cannot upgrade from the following:

Windows Server 2008
A 32-bit OS to a 64-bit OS
One language to another
A Technical Preview (TP) to a retail version
Server Core to Desktop Experience
A retail version of an evaluation version

A migration takes place when you bring in a new machine (physical or virtual) and you want to move the roles, features, apps, and settings into it. To do so, first you would want to install the OS on a new server, and then proceed with the migration. Prior to running a migration, make sure to check whether Windows Server 2016 supports your existing apps. The migration requires the Windows Server Migration Tool (WSMT) feature to be installed on a new server (see Figure 2.30).