For Windows Server 2012 Standard/Datacenter:
1.If you want to create domain user, log on DC and open Active Directory Users and Computers – <your domain> - right click Users and select New – User.
2.If you want to create local user, log on this server locally, right click Start button – Computer Management – System Tools – Local
Users and Groups – right click Users and select New User.
For Windows Server 2012 Essentials, you may open Dashboard - USERS – Add a user account.
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