LAN Manager
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The LAN Manager (not to be confused with NTLM) was an advanced Network Operating System (NOS) from Microsoft developed in cooperation with 3Com. It was designed to succeed 3Com's innovative 3+Share network server software which ran on top of MS-DOS.
LAN Manager is based on the OS/2 and NBF protocol similar to its predecessors MS-NET for MS-DOS and Xenix-NET for MS-Xenix. There was also LAN Manager/X (LMX) for UNIX based systems.
In 1990, Microsoft announced LAN Manager 2.0 with a lot of improvements. The latest version LAN Manager, 2.2, which included an MS-OS/2 1.31 base operating system, remained Microsoft's strategic server system until the release of Windows NT Advanced Server in 1993.
Many vendors shipped licensed versions, including:
- 3Com 3+Open
- HP LAN Manager/X
- IBM LAN Server
- Tapestry Torus
LAN Manager authentication uses a particularly weak method of hashing a user's password known as the LM hash algorithm.
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