Microsoft has released Windows Server Insider Preview Build 16278 to Windows Insiders

To obtain the build, registered Insiders may navigate directly to the Windows Server Insider Preview download page. Matching symbols and the Remote Server Administration Tools (RSAT) packages are available on the same page. When installed on a Windows 10 client, RSAT allows a user to remotely manage and administer Insider builds of Windows Server via GUI tools. Valid on Windows 10 client builds greater than 16250.

For the best experience, the Windows Server team recommends a clean install.

If you have not yet registered as an Insider, register through the Windows Insiders for Business program or the Windows Insider program.

  Windows Server Insider Preview Build 16278 released