Using existing Microsoft account for Windows Live Domain e-mail account

Hi,

I currently host my own e-mail domain (@example.com) and was considering moving it to Windows Live Domain.  I have an existing Microsoft account using an email address with the existing domain (*** Email address is removed for privacy ***).  If I moved the @example domain to Windows Live Domain and wanted to create a mailbox *** Email address is removed for privacy *** how do I go about it?  Do I just add an account name *** Email address is removed for privacy *** in my Windows Live Domain control panel?  Will the existing *** Email address is removed for privacy *** Microsoft account still retain all its associated information, such as Skype contacts, Windows Phone purchases and Xbox live purchases?