Many other builds were released until the Japan's Developers Day conference, when Steven Sinofsky announced that Windows 8 Release Preview (build 8400) would be released during the first week of June.
Beberapa build lain juga diluncurkan sampai konferensi Japan's Developers Day, ketika Steven Sinofsky mengumumkan bahwa Windows 8 Release Preview (build 8400) akan diluncurkan pada minggu pertama bulan Juni.