使用google后，得出一个结论，目前无法以用自己的域名绑定到team site！
http://technet.microsoft.com/en-us/library/jj819274.aspx "Office 365 Platform Service Description"
"Use a custom domain name for email, Lync Online, and team sites: Yes"
http://office.microsoft.com/en-us/office365-suite-help/can-i-add-custom-subdomains-or-multiple-domains-to-office-365-HA102818379.aspx
"You can add multiple domains to Office 365, and you can host any of the services on any of the domains."
http://onlinehelp.microsoft.com/en-us/office365-enterprises/hh416765.aspx "Compare domain management in different Office 365 subscriptions"
"You can have a multiple subdomains: for example, www.contoso.com, www.partners.contoso.com, www.partners.marketing.contoso.com, and so on. There are no restrictions on the number of domains that you can add to your account."