hi all, can we create sites with unique URL as https://ClientName1.site.com? and https://ClientName2.site.com with in the site collection. or can we create site collection with unique URL as https://ClientName1.site.com? and https://ClientName2.site.com with in the web application.

Hi, You can use host-named site collection. For more information please read this information: http://technet.microsoft.com/en-us/library/cc288637(office.12).aspxBest regards, Riwut Libinuko SharePoint Architect, Singapore Microsoft MVP | SharePoint Server | Singapore Blog : http://blog.libinuko.com