If you are using Outlook 98/2000, you may find the following step by step instructions of use.
Click 'Tools' (on the toolbar), then 'Accounts' (from the subsequent drop down menu)
Click the 'Mail' tab at the top of the resulting 'Internet Accounts' window
Click 'Add' > 'Mail'
Enter your name in the box provided, in the form that you would like the recipients of your mails to see, and then click 'Next'
Enter your email address (eg yourname@firstname.lastname@example.org and then click 'Next'
Select 'My incoming mail server is a POP3 server' (should already be selected by default)
Enter the Incoming Mail Server as shown in the table above in the 'Incoming mail server' box
Enter the Outgoing Mail Server as shown in the table above in the 'Outgoing mail server (SMTP)' box
Enter your email address email@example.com in the 'Account name' box
Enter your password
Ensure that the 'Remember password' box is ticked, then click 'Next'
Select the Internet connection option that is appropriate for your current setup, then click 'Next'
Double click the resulting email account, and go to the Servers tab. At the bottom of the form (Outgoing Mail Server), tick the box which says 'My Server Requires Authentication', and then click 'OK'.