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Microsoft has released Windows Server Insider Preview Build 16257 to Windows Insiders



What’s New in Build 16257 for Windows Server

Windows Subsystem for Linux (WSL) is available on Windows Server

Windows Subsystem for Linux (WSL) is now available on Windows Server along with a compliment of Linux distributions.
Test WSL on Windows Server. WSL runs unmodified Linux (ELF64) binaries natively. With the additions of WSL you can run node.js, Ruby, Python, Perl, Bash scripts or other tools that expect Linux behaviors, environment, or filesystem-layout, the ability to install and run Linux with WSL expands the tools at your disposal on Windows Server.
At this time, WSL does not support persistent Linux services (such as daemons and jobs) as background tasks. To enable WSL and install a Linux distribution, see Enable the Windows Subsystem for Linux and Install a Linux distribution in the Windows Server 2016 Installation Guide on GitHub.
Read more in this blog or follow the installation guide to try it out.

Delivery Optimization is available for Windows Server

Delivery Optimization has been the main downloader of Windows Update and Windows Store content since the Windows 10 Anniversary Update, providing faster and more reliable downloads. Starting in the latest builds for Server, Delivery Optimization is now the downloader used by Windows Update on Windows Server.Delivery Optimization can also provide Peer-to-peer bandwidth optimization between Windows Server machines. To enable peer-to-peer downloads open Settings -> Update & Security -> Advanced Options -> Delivery Optimization and turn ON the toggle to “Allow downloads from other PCs”.

To download this insider preview, register at the Windows Insiders for Business program or the Windows Insider program and then navigate to the Windows Server Insider Preview download page.

  Windows Server Insider Preview Build 16257 released