I have a 2003 exchange server and have a few users that are using OWA to access their email on the LAN using HTTP not https. It had been prompting them for a username and password, but after a server restart it no longer prompts them, rather it goes straight in as the user that is logged into the computer. The reason this is a problem is that a few of the workstations have several users that move around and generic usernames are used to log on to the workstation so they can stay logged in all day.
What setting would have changed? It has been working correctly for a couple of months until this restart.