Jun 07, 2011 05:14 AM|raduenuca|LINK
First of all do you require your users to input a user and password for your web application?
If answer is no the use None as the authentication mode
If yes and your application runs in a windows intranet then use Windows
If yes and you will be the one managing the user accounts then use Forms (plan for a user registration page as well)
If yes and you don't want to manage user accounts and you're not running your app in an Intranet use Passport (which is Windows Live ID now)