Microsoft has released Windows Server 2025 build 26334 for Windows Insiders, marking the final update for the year, with the next expected in January 2024. This build includes Desktop Experience and Server Core installation options for Datacenter and Standard editions, as well as the Annual Channel for Container Host and Azure Edition for virtual machine evaluation. The branding remains Windows Server 2025 in this preview, and issues reported should reference Windows Server vNext preview. Users enrolled in Server Flighting will receive this build automatically.
New features include Windows Defender Application Control for Business (WDAC), which enforces a list of permitted software to minimize the attack surface, and improved accessibility for Windows Admin Center (WAC), allowing installation directly from the Windows Server Desktop for Datacenter or Standard preview users.
There are known issues, including a labeling error that may reference Windows 11, which Microsoft plans to fix in a future release. Windows Server build 26334 is valid until September 15, 2025, with specific installation keys provided for Server Standard and Datacenter editions, while no key is required for Azure Edition.