Windows 10 build 19533

Windows 10 build 19533 is an unleaked build of Manganese. It was found on April 28, 2020 at the description of a Feedback Hub quest that showed the graphing function of Calculator, where it was stated that "the Graphing feature is available on Windows 10 build 19533 or greater." Two days later, on April 30, a tweet from the official Windows Insider Program account mentioned that 19533 was an internal release.