Microsoft is making available the release-to-manufacturing bits of Windows Server 2016 and System Center 2016 today, October 12th 2016.
Microsoft officials said at the company's recent Ignite conference that customers should be able to get the final Windows Server 2016 bits by mid-October. During Ignite, Microsoft released the Evaluation version of Windows Server 2016, but not the final version. At Ignite, officials also announced all Windows Server 2016 customers will get the commercially available Docker engine for no additional cost.
As of today, Microsoft is releasing the RTM version of its latest Server release to MSDN, as an Azure image and likely via its Volume Licensing Service Center. (Thanks to Aidan Finn and Marko Loukkaanhuhta for the heads up on Azure and MSDN availability.)...
Download Windows Server 2016 evaluation
Read the Ultimate Guide to Windows Server 2016