For those folks using Windows Server 2012, you’re in luck. The mainstream support for Server 2012 has been extended due to the timing of the release of the latest version – Server 2016. The new extended dates have been moved up to 10.10.2023, with mainstream support ending 10.9.2018.
The Lifecycle Policy for Windows Server 2012 states that Mainstream Support will be provided for five years, or for two years after the successor product (N+1, where N=product version) is released, whichever is longer. Microsoft will also provide Extended Support for the five years following Mainstream Support or for two years after the second successor product (N+2) is released, whichever is longer.