Windows Millennium Edition (referred to as Windows ME) was the last 16/32 bit hybrid version of the Microsoft Windows operating system. Windows ME was released to manufacturing on 2000-06-19 and to retail on 2000-09-14. It was criticized due to its instability, and was sold on the market for a total of 402 days before being superseded by Windows XP on 2001-10-25. Some components of Windows 2000, such as the TCP/IP stack, were ported to Windows ME.