Back in when I had version 5.1 it was generally advised that should disable
Spanning Tree on any Network Switches connected to the 5.1 server.

I now have a network composed of 6.5 servers (sp2 on one, sp4 on the other)
and workstations running Windows 98, 2000 Pro and/or XP Pro. The current
Novell client for the applicable OS will be installed.

Should I leave spanning tree disabled in my network switches, or is it
"safe" to enable it once again?