On your computer, click the Start Menu and select Control Panel.
Double-click the Mail icon. If using Windows Vista, Windows 7 or Windows 8, type Mail into the search box at the top-right of the Control Panel window to quickly find the Mail icon.
Click the E-mail Accounts button.
Under the E-mail tab, click the New button to add your 1&1 e-mail account.
Select E-mail Account and then click the Next button.
Enter Your Name, E-mail Address, and e-mail address Password and then click the Nextbutton.
Outlook will attempt to autodetect your e-mail settings. If a window appears attempting to configure your e-mail account using settings from the autodiscover.1and1.info website, Check the box that says Don't ask me about this website again and then click the Allow button.
After a few moments your should receive a confirmation that the e-mail account is successfully configured. Click the Finish button to complete the process.