Windows ME Build 4.90.2223.1

Windows ME Build 4.90.2223.1 is the earliest leaked, albeit disputed build of Windows ME. It was released to developers on 1999-05-19, and is partially disputed as a post-RTM build of Windows 98 Second Edition, due to being very close, if not identical to Windows 98 Second Edition RTM, with only a few changes noted. It is thought that this build was used to test planned features for Windows ME on the more stable, non-beta release Windows 98 Second Edition. A few references to Codename Millennium are made in the setup files, which leads many to believe that this was the earliest build of Windows ME.