In Outlook Express, choose 'Tools' on the menu bar, and then select the 'Accounts' entry. The Internet Accounts window should open. Select 'Add', then 'Mail' from the drop-down menu. A new mail wizard will guide you through creating your account.
2. Type in your name in the 'Display name' field and click 'Next'.
3. Click the 'I already have an email address that I would like to use' radio button and enter your email address (username@o2.co.uk) in the 'Email address' field, then click 'Next'.
4. Ensure that 'POP3' is selected in the incoming mail server drop-down list. Enter mail.o2.co.uk in the Incoming mail server field and mail.o2.co.uk in the Outgoing mail server field.
5. Enter your username in the 'Account name' field (username@o2.co.uk). Add your password in the 'Password' field, and click the 'Remember password' check box if required. Click on 'Next'.
6. Click on 'Finish' to complete your mail account creation.
7. Click on 'OK', and close the Internet Accounts window.