| Developer | Microsoft, 3Com |
|---|---|
| OS family | OS/2 |
| Working state | Discontinued |
| Source model | Closed source |
| Initial release | 1987 |
| Final release | 2.2a / 1994 |
| Marketing target | Local area networking |
| Update method | Re-installation |
| Package manager | None |
| Platforms | x86 |
| License | Proprietary |
| Preceded by | MS-Net, Xenix-NET, 3+Share |
| Succeeded by | Microsoft Windows NT 3.1 |
LAN Manager is a discontinued network operating system (NOS) available from multiple vendors and developed by Microsoft in cooperation with 3Com Corporation. It was designed to succeed 3Com's 3+Share network server software which ran atop a heavily modified version of MS-DOS.