As with the desktop version, Windows Server 2012 is given a plethora of regular updates. Larger organisations tend to check updates on a test server before rolling them out to a production environment. But others can set the server to roll out updates automatically.
To do this, go to the Server Manager, click on the "Not Configured" link next to Windows Update. This will show the Windows Update box. Click on "Turn On Automatic Updates" button. This will make the server download and update the operating system automatically.
There is another option to "Download updates but let me choose whether to install them", which may be more appropriate to install updates during planned server maintenance.
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