Tiger Shark, just in case if you really want all your user to switch to firefox, i got a solution for you. Setup both IE and FireFox for all their PC. Write a little script that swap the shortcut icons of IE and firefox schedule it to run once every 5minutes. If that cant convince them to start using FireFox, try point the default webpage to www.about.com and close off the permission for them to modify registry. Remember to standby high quality ear plug. (Sony have noise cancellation headphone, good for this cause).