Windows 8 RTM build number reportedly goes up to 8523 July 25, 2012 by admin Tweet A new update on a reliable third-party Windows 8 build number list shows that the current Release to Manufacturing (RTM) candidate build number has gone up to 8523. Read more… Neowin Related Posts:Windows 11 Insider Release Preview build 22621.1926…Windows 10 22H2 build 19045.3633 (KB5031445) is now…Windows 10 April 2023 non-security preview build…Windows 11 Release Preview (KB5022913) makes…Windows 11 Build 22000.1757 in Release Preview…