I'm running about 1100-1200 mailboxes on a Dual Xeon 2.8ghz with 4 gigs of ram . Until recently, I had 400 gigs worth of stores. Right now I'm down to about 275gigs worth. I think this server would easily handle another 1500-2000 mailboxes based on the memory/cpu utilization I've seen. With 3.6 or 3.8ghz processors I think 4000+ users on a dual box would be fine. It should be noted this server has nothing on it except A/V and stores . I have a front-end server as an SMTP/POP3/IMAP/OWA gateway. -----Original Message----- From: Teo De Las Heras [mailto:teoheras@xxxxxxxxx] Sent: Monday, March 06, 2006 6:32 PM To: [ExchangeList] Subject: [exchangelist] Dual or Quad for 4000 users http://www.MSExchange.org/ I've come across the rule of thumb that there should be a processor for every 1000 users. I've also looked at the MMB3 stats as well. My question is, what's the best way to determine the number and type of processors needed for 4000 users on Exchange 2003? Teo ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: emann@xxxxxxxxxxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to info@xxxxxxxxxxxxxx