In the early 90s IPX/SPX was more common for LANs than the IP stack. It required much less configuration. Managing IP addresses in the days before DHCP was a hassle, while IPX just used MAC addresses directly. It also was just a simpler protocol. This was in the days of DOS where the driver had to run as a TSR the lower 640KiB memory area, so the driver size mattered.

In the later 90s IP pushed it out, partly due to Novel Netware fading away, and partly because IPX didn't scale to large networks the way IP can.