I m developing ASP.Net project in company. Every user has an unique exchange account.

Im trying to authenticate the user based on teh user's Exchange credentials for web project. I want to use exchange server account for each user.

I just dont want to add users to database, because they already have userid and password in exchange server.

For example;

User id: user_email

pass: users email password

How can I use this data in my c#.net project?

Thanks.