Slow Network

Hi everyone,

Pls i want to know for sure if too many servers can slow down a network?

I am troubleshooting network with about 17 servers; about 7 are actual servers while the rest are desktops con servers.

Some of the servers are both runing windows 2003 standard & Enterprise editions while the others windows 2000 servers, 2 0f them has MS exchange 2007 installed,1 is is for Antivirus etc.
Thanks