Did you know that you can use any email address to sign up for a Windows Live ID? Which means you can use any email address to access Hotmail or Messenger for example, or SkyDrive or Spaces or any other Windows Live Service.
So if I have an existing email address such as firstname.lastname@example.org then I can use that as my Windows Live ID.
Simply visit this link to sign up using your own email address
Or if you don’t need to use email with your Windows Live ID ie you don’t need access to Hotmail, perhaps because you already have an email service, you can sign up for a limited Windows Live ID. This works just like any other Windows Live ID except you can’t use Hotmail with it. The signup process is somewhat simplified as a result.