Hi ewq,
If you want to use the service in Office 365 for your domain, you should add the domain in Office 365 and point the DNS records to Office 365.
Please refer to the link below to add domain and point the DNS records to Office 365:
For Office 365 for small business:
Add your domain to Office 365 http://onlinehelp.microsoft.com/en-us/office365-smallbusinesses/ff637561.aspx
Verify a domain at a domain name registrar http://onlinehelp.microsoft.com/en-us/office365-smallbusinesses/gg584174.aspx
Change name server records at a domain registrar http://onlinehelp.microsoft.com/en-us/office365-smallbusinesses/gg549203.aspx
For Office 365 for enterprise:
Add your domain to Office 365 : http://onlinehelp.microsoft.com/en-us/office365-enterprises/ff637620.aspx
Verify a domain at any domain name registrar: http://onlinehelp.microsoft.com/en-us/office365-enterprises/gg584188.aspx
Edit DNS records for your Office 365 services : http://onlinehelp.microsoft.com/en-us/office365-enterprises/ff637620.aspx
If you want to host the website on previous server(keep your current website), please refer to the information below to achieve this:
1.P plan and not change name server
If you use Office 365 subscription Plan P and you do not change the name server records for your domain, please refer to the link below and just add the required DNS records for your domain to work with Office 365 services without redirecting name server records:
http://onlinehelp.microsoft.com/en-us/office365-smallbusinesses/hh416759.aspx
2.P Plan and change the name server
If you use Office 365 subscription Plan P and you have changed the name server records to point to Office 365, please refer to the link below for how to move your email to Office 365 and keep your current public-facing website:
http://onlinehelp.microsoft.com/en-us/office365-smallbusinesses/hh335299.aspx
http://onlinehelp.microsoft.com/en-us/office365-smallbusinesses/hh335298.aspx
3.E Plan
If you use Office 365 subscription Plan E, please make sure you do not select SharePoint Online service under Domain intent when you first add and verify your custom domain in Office 365.
Please check it by following the steps below:
1. Log in Office 365, click Admin
2. Click Domains->Domain properties
Make sure the SharePoint Online is not selected.
For the license, it will be counted by the emails address. You can get more information about user license by referring to the link below:
For Office 365 subscription of small and business:
http://onlinehelp.microsoft.com/en-us/office365-smallbusinesses/gg570298.aspx
For Office 365 subscription of enterprise:
http://onlinehelp.microsoft.com/en-us/office365-enterprises/gg570315.aspx
Thanks,
Linda Wang
