We’ve made some adjustments to our system that should allow you to proceed registering your domain to Windows Live Admin Center. Please try it again.
However it still won't allow me and I can't respond to original post as it's locked.
http://answers.microsoft.com/en-us/windowslive/forum/mail-signin/this-domain-name-cant-be-used-because-it-contains/cd33641e-5392-40ad-98f5-d63f7e4c5649?tm=1381676524225
Regards,
Duane
Recent Comments