Microsoft online exchange on Apple mail

You can use Microsoft single sign on application to configure your entourage on Mac OS.
But if you are using apple mail then you need to do below steps manually to configure your exchange online account on snow leopard:-

On apple mail client -->Add account --> Provide username( email address) and password --> Exchange 2007 --> Select SSL --> Provide internal and external server details --> create

Note:- Server Name will be red001.mail.microsoftonline.com ( I am considering north america server). Server name depends upon your subscription location.