In 1991, if you were running a personal computer network in your business or enterprise, there was a good chance it was running on Novell's NetWare, which was the predominant server-based network operating system at the time. Released in both 16-bit and 32-bit versions for the 286 and 386 Intel processors, 1990's era NetWare ran on a proprietary protocol called IPX, which ran on on Local Area Networks using Ethernet, Arcnet or IBM Token-Ring topologies. NetWare was known for its excellent network performance, server reliability, fault tolerance and OS stability, as well as its relatively easy administration, which helped it maintain its market position for many years.
Novell had several competitors in the space, such as IBM OS/2 LAN Manager and Banyan-Vines, but none of them were ever as popular as the NetWare stack. However, with the release of Microsoft's Windows for Workgroups 3.1 in 1992 and Windows NT operating system in the summer of 1993, companies quickly began to shift to a fully integrated, single-vendor Client and Server OS solution for their networks.
Still, even today, many companies still maintain legacy NetWare systems. NetWare continued to be developed until 2003, where it was superseded by Open Enterprise Server (OES), a network operating system which runs on top of Linux.
In November of 2010, Novell was acquired by Attachmate, for $1 Billion.