1. Login to your Comcast (xfinity) account and access your mailbox.
2. Click on the Address Book link in the menu bar.
3. When the address book opens, click on the Export All link and Select Microsoft Outlook (CSV).
4. Click on the Export buttom and save the file location on your disk (i.e. Desktop).
5. When prompted, specify location and name for the file in the Save As dialog box. Then press Save (if the export windows remain open after the export has completed, just click Cancel to close it).