http://www.microsoft.com/technet/prodtechnol/exchange/guides/PlanE2k3MsgSys/1a11b866-f6e1-4ad4-9e59-4ab0fc24cb02.mspx?mfr=true

 

http://www.msexchange.org/tutorials/Art-Science-Sizing-Exchange2003-Part1.html

 

It all depends on your users, how big their mailboxes are going to be, your servers network connectivity and what your SLA is / will be.  You could easily fit 3000 users on a single server ...but will that capacity meet your SLA ... will you purchase a server with a single 2ghz Celeron processor or a dual core Xeon?  Do you need some form of high availability?

 

Understand your environments requirements and go from there.  Don't buy hardware and then try to make it work with what you need.

 

 

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From: exchangelist-bounce@xxxxxxxxxxxxx [mailto: exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of jithendranath reddy

Sent: Tuesday, May 30, 2006 5:18 AM

To: exchangelist@xxxxxxxxxxxxx; [ExchangeList]
Subject: [ExchangeList] What is the recommanded memory for 3000 mail boxes

 

Hi

 

Can some body help me that i want to know what is the recommanded memory and processor requires for 3000 mail boxes with two exchange servers.

 

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Thanks & Regards
A.JITHENDRA NATH REDDY.
Server Administrator
Network Solutions-An IBM Company