The document summarizes the evolution of the Windows operating system. It discusses how Microsoft popularized the Windows concept started by Apple, with Windows 3.0 becoming reasonably popular for use in offices, homes, and businesses. Windows 3.1 and 3.11 for workgroups allowed networking on a LAN environment. Windows 95 was a complete operating system, while Windows NT was produced independently and designed for business use. Windows XP professional satisfied business demands and improved on its predecessor.