Sep 09, 2013 04:44 AM|Angie xu - MSFT|LINK
Is it possible to integrate with active directory if a customer is using it and not for another in the same login screen?
Because we are able to import users from AD, so I think you could do that, please have a look the links below,
“Active Directory Integration” in your .NET app
Single sign on for .NET application integrated with Active Directory
hope it helps,