Windows Server 26257 introduces Server Flighting, allowing users to get preview builds weeks ahead of release

The capability can be a game changer for organizations.

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by Milan Stanojevic 

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Windows Server 26257

Microsoft released the Windows Server 2025 Preview Build 26257, which offers complete and Azure-only versions for Long-Term Servicing Channel (LTSC) customers. The Redmond-based tech giant introduced many features with it, including setting up the Windows Admin Center management tool directly from the server’s desktop.

The support for delegated Managed Service Accounts (ADMSA) was another introduction to Windows Server. It offers an advanced substitute for Group Managed Service Accounts (gMSA) and is explicitly designed to counter “kerberoasting” attacks on service accounts by binding the account with particular machine identities.

Preview Build 26257 also introduces the Windows Server Flighting. It will allow users to obtain preview builds automatically at some point later on. Also, a Feedback Hub app for Windows Server Desktop users and a new Windows Subsystem for Linux version are part of this.

Certainly, being a preview build, there are a few things to note, such as a bug that halts the upgrade process completely and an issue with using the Diskpart command on some VMs. The full release notes contain a complete list of all known issues and other essential details about this build.

If you are a Windows Server Insider, you can get this build from Windows Update.

In other news, the Windows Insider Program received two new patches: one for the Dev Channel and the other for the Beta Channel. Each brings huge changes to the operating system.

Milan Stanojevic

Milan Stanojevic Shield

Windows Toubleshooting Expert

Milan has been enthusiastic about technology ever since his childhood days, and this led him to take interest in all PC-related technologies. He's a PC enthusiast and he spends most of his time learning about computers and technology. Before joining WindowsReport, he worked as a front-end web developer. Now, he's one of the Troubleshooting experts in our worldwide team, specializing in Windows errors & software issues.