Windows 2016
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Change Admin User Name2017/02/05

Change Administrator User Name for security reason.
[1] Run [Server Manager] and Open [Tools] - [Computer Management].
[2] Open [Local Users and Groups] - [Users] on the left pane and and Right-click [Administrator] and select [Rename] on the right pane. Then, Change any name you like.
[3] Administrator Name is just changed.
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