Windows Server 2027

= Windows Server 2027 =
== Windows Server 2027 ==
=== Release date ===
June 1, 2027
=== Created by ===
Microsoft
=== OS family ===
Windows "Riverstone"
=== Source model ===
Closed-source
=== Update method ===
Windows Update
=== Kernel type ===
"Riverstone"
=== Latest version ===
29H2 (stable)
=== Latest version (to date) ===
Dev Channel (39365.2411)
=== State ===
Unreleased
=== Support ends ===
Mainstream support: September 10, 2038, extended support: December 10, 2042
=== Codename ===
Riverstone One
=== Final name ===
Windows Server 2027
=== Preceded by ===
Windows Server 2025
=== Succeeded by ===
Windows Server 2029
Windows Server 2027 (codenamed Riverstone) is the long term servicing channel release of Windows Server, which was released on 1 June 2027. Following the established release cadence, Windows Server 2027 was the next iteration of the server operating system originally expected in late 2026. Windows Server 2027 improves upon the application sandboxing, vulnerability management tools and deeper integration with Azure Security Center. Windows Server 2027 also provides tools for managing and deploying workloads across on-premises servers and Azure cloud services.
Following the release of Windows Server 2027, the Windows Server Manager and taskbar have also been redesigned.
== Contents ==
* 1New features and additions
* 2Insider builds
** 2.1Build 38880.1001 (08-07-2026)
** 2.2Build 38895.1001 (15-10-2026)
** 2.3Build 38917.1505 (03-11-2026)
** 2.4Build 38934.1409 (22-12-2026)
** 2.5Build 38941.1665 (03-01-2027)
** 2.6Build 38949.1001 (20-01-2027)
** 2.7Build 38955.1101 (07-02-2027)
** 2.8Build 38968.1688 (28-02-2027)
** 2.9Build 38987.1065 (16-03-2027)
** 2.10Build 38997.1001 (25-03-2027)
** 2.11Build 39007.1266 (01-04-2027)
** 2.12Build 39014.1770 (13-04-2027)
** 2.13Build 39022.1005 (29-04-2027)
** 2.14Build 39031.1205 (06-05-2027)
** 2.15Build 39047.1667 (26-05-2027)
** 2.16Build 39059.1950 (01-06-2027)
** 2.17Build 39077.1454 (14-06-2027)
** 2.18Build 39091.1152 (25-06-2027)
** 2.19Build 39100.1001 (01-07-2027)
* 3Gallery
== New features and additions ==
* The Windows NT kernel has been discontinued and replaced with the Riverstone kernel.
* Updated sandboxing and vulnerability management tools.
* Windows Server Manager has been redesigned.
* Deeper integration with Azure Security Center.
* Servers using Legacy BIOS are no longer supported.
* Monitors under 1080p are no longer supported. Any Ultra HD resolution has become the standard.
== Insider builds ==
=== Build 38880.1001 (08-07-2026) ===
Windows Server build 38880.1001 is a Windows Server Insider Preview build released on 8 July 2026. It is the first Windows Server Insider Preview build published after the release of Windows Server 2025 build 33102.1001, as well as the first Server build released in the Ununoctium semester.
This build has the same UI, features and design as Windows Server 2025 build 33102.1001 with a changed build number.
=== Build 38895.1001 (15-10-2026) ===
Windows Server build 38895.1001 is a Windows Server Insider Preview build released on 15 October 2026. It is the first Server build to be released after an almost three month gap since build 38880.
It includes improvements to performance, making it slightly faster than the previous build.
=== Build 38917.1505 (03-11-2026) ===
Windows Server build 38917.1505 is a Windows Server Insider Preview build released on 3 November 2026.
It includes a very rough version of Windows Server Manager, which can be enabled by changing a registry value in HKEY_LOCAL_MACHINE. The application is only usable through Command Prompt by changing the directory to C:\Windows\System32\Beta\Hydrogen and adding "srvmgmt" to the beginning of a command. Interestingly enough, attempting to run a "srvmgmt" command without changing the registry value, this build attempts a bugcheck with error code ERR_SYSTEM_SERVICE_EXCEPTION.
=== Build 38934.1409 (22-12-2026) ===
Windows Server build 38934.1409 is a Windows Server Insider Preview build released on 22 December 2026.
This build begins to integrate Windows Server Manager's own user interface. It is unknown how to access the UI, but the Server Manager is still usable by following the steps from build 38917.
=== Build 38941.1665 (03-01-2027) ===
Windows Server build 38941.1665 is a Windows Server Insider Preview build released on 3 January 2027.
This build is unbootable, and attempting to boot it will result in a bugcheck with error code ERR_DRIVER_CANCEL_TIMEOUT. This build was never publicly released to the Windows Insider Program.
=== Build 38949.1001 (20-01-2027) ===
Windows Server build 38949.1001 is a Windows Server Insider Preview build released on 20 January 2027. This is the final build in the Ununoctium semester.
This build discontinues Legacy BIOS, and any Legacy BIOS machine attempting to install this build will cause a bugcheck with error code ERR_LEGACY_BIOS_DISCONTINUED, followed by an automatic revert to the previous operational build of Windows. This build also introduces Windows Server Manager's user interface, albeit a very rough version with a simple white background, Windows Classic themed buttons and non-functional status indicators. This build also changes the version string to "27H1".
=== Build 38955.1101 (07-02-2027) ===
Windows Server build 38955.1101 is a Windows Server Insider Preview build released on 7 February 2027. This is the first Windows Server build to be released in the Lawrencium semester.
This build introduces the new floating taskbar design. Windows Server Manager's design is also updated to follow the Fluent design language. Windows Server Manager is still non-functional through its user interface.
=== Build 38968.1688 (28-02-2027) ===
Windows Server build 38968.1688 is a Windows Server Insider Preview build released on 28 February 2027.
This build updates the sandboxing and vulnerability management tools from the previous Windows Server 2025.
=== Build 38987.1065 (16-03-2027) ===
Windows Server build 38987.1065 is a Windows Server Insider Preview build released on 16 March 2027.
This build is unbootable. Attempting to boot this build will result in a bugcheck with error code ERR_STATUS_IMAGE_CHECKSUM_MISMATCH. This build was never publicly released to the Windows Insider Program.
=== Build 38997.1001 (25-03-2027) ===
Windows Server build 38997.1001 is a Windows Server Insider Preview build released on 25 March 2027.
This build provides performance and general optimization updates, making this build slightly faster than previous Riverstone builds.
=== Build 39007.1266 (01-04-2027) ===
Windows Server build 39007.1266 is a Windows Server Insider Preview build released on 1 April 2027.
This build starts the transition from the Windows NT kernel to the Riverstone kernel, which Windows Server 2027's codename was named after. The kernel's API contains a program that diverts Windows NT API calls to the Riverstone kernel, preventing most applications from malfunctioning.
=== Build 39014.1770 (13-04-2027) ===
Windows Server build 39007.1266 is a Windows Server Insider Preview build released on 13 April 2027. This is the final build in the Lawrencium semester.
This build marks the completion of the integration of Riverstone into Windows Server. This build also completes the redesign of Windows Server Manager. The Command Prompt version of Windows Server Manager is removed from this build onward.
=== Build 39022.1005 (29-04-2027) ===
Windows Server build 39022.1005 is a Windows Server Insider Preview build released on 29 April 2027. This is the first Windows Server build in the Ruthenium semester.
This build provides performance and optimization updates, making it slightly faster than previous builds.
=== Build 39031.1205 (06-05-2027) ===
Windows Server build 39031.1205 is a Windows Server Insider Preview build released on 5 May 2027.
This build provides general bug patches.
=== Build 39047.1667 (26-05-2027) ===
Windows Server build 39047.1667 is a Windows Server Insider Preview build released on 26 May 2027.
This build was showcased at a Microsoft event, announcing the release of Windows Server 2027 by July.
=== Build 39059.1950 (01-06-2027) ===
Windows Server build 39047.1667 is a Windows Server Insider Preview build released on 1 June 2027.
This build provides deeper integration with Azure Security Center, including centralized security management, advanced threat analytics and automated vulnerability patching. The version string is changed to "27H2".
=== Build 39077.1454 (14-06-2027) ===
Windows Server build 39047.1667 is a Windows Server Insider Preview build released on 14 June 2027.
This build provides general bug fixes, preparing for the final RTM release of Windows Server 2027.
=== Build 39091.1152 (25-06-2027) ===
Windows Server build 39091.1152 is a Windows Server Insider Preview build released on 25 June 2027. This is the final build in the Ruthenium semester.
This build is featured in another Microsoft event, a few days before the RTM release.
=== Build 39100.1001 (01-07-2027) ===
Windows Server build 39100.1001 is the Windows Server 2027 RTM build released on 1 July 2027.
This build is the RTM release of Windows Server 2027, removing all Microsoft development tools and mentions of the Riverstone codename, replacing it with the Windows Server 2027 branding.
== Gallery ==
Windows-Server-2027-startup-screen.png
Windows Server 2027 startup screen
Windows Server 2027 desktop.png
Windows Server 2027 in widescreen (5160x2160)
Windows Server 2027 bugcheck.