Windows 8.1 build 9600.16581

Windows 8.1 build 9600.16581 is a build of the Spring 2014 update for Windows 8.1. This build was leaked on 4 January 2021 in Brazilian Portuguese in AMD64 architecture.

On 8 January 2014, WZor.Net released an article that described this build. Seven screenshots were published in the article. They also posted several screenshots on Twitter.

On 13 January 2014, another screenshot was posted by Hipek to the CentrumWindows ▪ forum.