Password not required anymore

I'm running Windows 7 with Windows Live Mail 2011. My wife and I have two separate email accounts setup on this home computer. We both have our own email password. Up until a few days ago when you would click the send/receive tab in the tools folder a window would open and you would have to type in the password for that email account. I don't think we did anything different or downloaded anything but now when we click on the send/receive for our particular account it will start downloading the email off the server, don't like this, want to have to enter password for our own accounts. What might of happened and how do I put it back to the way it was? Thanks