ISA server 2000 [tweak to limit memory]
ISA default to use 50% of free memory.
ISA Management -> Servers and Arrays -> Servername -> Cache Configuration
-> Advanded tab. Next to Percentage of free memory to use for caching,
change the number from 50 to 10.
Smallbizserver.Net > SBS 2003 > ISA Server 2000 > W3PROXY.EXE takes a lot of Ram:
http://www.smallbizserver.net/Default.aspx?tabid=132