Microsoft Office Live Small Business Community

I have my prefered domain hosted elsewhere. I would like to use the Office Live Small Business for my Email and a website, but Not for all of my websites. So I would like to be able to redirect my MX record and a host on my DNS say live.mydomain.net. Is there a way to do this, or is all or all web, or...

I have a old live id (company e-mail address) and just yesterday I attempted to transfer domain/e-mail to Small Business Live. Unfortunatley, I now can't seem to use my old e-mail address. when I try to add it is errors. Is there a work-a-round? I would really to use my e-mail address since that...