Do I need to buy a second domain name for my SharePoint™ Services site
From mail2web.com Wiki
If you already own a domain name, you don't need to register a second domain name in order to sign up for a SharePoint™ Services web site. You can easily activate a SharePoint Services hosting plan using a sub-domain name, based on your existing domain name registration. For example, if your domain name is www.your-domain.com, you could sign up for a SharePoint Services account under a sub-domain like:
- internal.your-domain.com
- external.your-domain.com
- intranet.your-domain.com
- extranet.your-domain.com
- team.your-domain.com
- sharepoint.your-domain.com
- partner.your-domain.com
- portal.your-domain.com
- wss.your-domain.com
- group.your-domain.com
- Or anything else you choose!
All that you will need to do is sign up using the sub-domain you have selected and we will provide you with the DNS settings for your account. Then contact your current hosting provider and ask them to make a modification to your DNS record to create the sub-domain for you.
Or if you already host your domain name with myhosting.com or services.mail2web.com, we'll make the modifications for you automatically when you sign up for your account!
