Setting up mail server on small biz server 2003

Hi.
Pls i want to know how to setup a server running sbs 2003 so that all the company mails are stored in the mail server and every other computer on the network gets its mail from the company mail server instead of everybody struggling to get mails from then domain.
the idea is incase of internet failure/down time users can still get mails that the server have already downloaded.

thank you
any info appreciated

In Outlook, under account settings, select "Enable Cached Exchange Mode". This should allow your users to work in "offline" mode. Basically if they're not connected to the Exchange server they can still view (in Outlook) any emails they've previously downloaded, respond to them, and when they reconnect to the Server their mail will sync up.

do i need to install another software? (eg microsoft exchange) or will outlook express in sbs 2003 do the job?

thank you

You will need to use Microsoft Exchange and Microsoft Outlook (not Outlook Express).