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LAN Manager was a network operating system developed by Microsoft in collaboration with 3Com in the 1980s. It provided file and print sharing capabilities over local area networks (LANs) and was designed to run on top of MS-DOS or OS/2. Below is a detailed version history of LAN Manager with verified Wikipedia URLs for further reference.

LAN Manager 2.2 was the final major release of LAN Manager. It introduced improved performance and enhanced security features, such as support for NTLM (NT LAN Manager) authentication. LAN Manager 2.2 also included better support for networking over TCP/IP, which was becoming the standard protocol at the time. This version marked the end of LAN Manager's development, as Microsoft began focusing on Windows NT as its flagship networking platform. https://en.wikipedia.org/wiki/LAN_Manager#History

LAN Manager 2.1 improved stability and added support for extended file systems and networking protocols. It also introduced better integration with OS/2 and was optimized for use in corporate environments. This version allowed for more efficient file and printer sharing, as well as improved network administration tools. https://en.wikipedia.org/wiki/LAN_Manager#History

LAN Manager 2.0 was a significant update that introduced support for TCP/IP in addition to the previously used NetBEUI and IPX/SPX protocols. This release also featured better integration with OS/2 and improved performance when running on larger networks. LAN Manager 2.0 allowed for more extensive networking and scalability, making it suitable for medium to large businesses. https://en.wikipedia.org/wiki/LAN_Manager#History

LAN Manager 1.0 was the initial release of the system, developed by Microsoft and 3Com to provide file and print sharing capabilities over local area networks. It supported the NetBEUI protocol and ran on top of MS-DOS and OS/2. The system allowed multiple users to share resources such as files and printers, marking a significant step forward in LAN technologies at the time. https://en.wikipedia.org/wiki/LAN_Manager#History

LAN Manager played an important role in the early development of networked environments, providing essential file and printer sharing services in the era before Windows NT and other more advanced networking operating systems. While its development ended with version 2.2, LAN Manager paved the way for later advancements in networking technology, particularly through its introduction of TCP/IP support and integration with OS/2. Its legacy remains as a foundational product in the history of local area network operating systems.