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1990 Networking: LAN Manager 2.0

In 1990, Microsoft released LAN Manager (LM) 2.0, a member of a long line of Microsoft’s networking products that started with MS-NET circa 1984 and eventually morphed into Windows NT file sharing. LAN Manager 1.0 was released in 1988 as an OEM-only product, with the largest OEM being 3Com and their 3+Open.

Also in the press release is the following statement: “LAN Manager version 2.0 will ship during the month of August.” It is unfortunately unclear whether that was LM 2.0 directly from Microsoft or through OEMs. Keeping in mind the timeline described earlier, LM 2.0 was built in June 1990 but hardly anyone had any chance at all to install it before September 1990 due to the dependency on MS OS/2 1.21. The debug kernel does not run on any halfway modern CPUs without patching because, like other Microsoft system debuggers of the era with 386 support, it accesses test registers that were removed from the Intel Pentium and later processors.

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