APM SSO Conf. help

In my case, i have different applications like exchange, sharepoint and so on ... Each application is served by a VS. all Virtual servers are linked to the same access profile. for a single user, he can access all applications using his Active Directory Credentials. So, i think multiple domain auth will not help in this case right ? we need to make this user access for example exchange using its VS after that when he tries to access all other applications Virtual servers, he will no more need to enter credentials again.