This build was partially leaked, and then fully leaked on April 19, 2013. It's the first leaked build to call itself "Windows 8.1"
New features
- Updated icons.
- Further updated control panel.
- Updated charm bar. (Charm bar -> Settings)
- Updated branding. (Windows 8.1 Pro Preview)
- Does NOT support ReFS. ("This version of Windows doesn't support ReFS format on drive (Drive letter)")
- New search pane.
- New/Updated add new features.
