Windows Server build 19504

Windows Server build 19504 is a build of Windows Server Manganese. Screenshots of downloads related to this build were shown on Twitter on 26 October 2019. The download IDs for this build were found on 19 June 2021, but were taken down by Microsoft prior to their discovery.

Difference from Insider Previews
This build was available in both the LTSC and Semi-Annual Channel formats as seen in the screenshots. This is a notable difference from released Insider Previews, as they were only available in the Semi-Annual Channel format.