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I have users that access their e-mail VIA OWA. Recently it has been brought to my attention that when they logout of OWA using the log out button it does not actually log them out. If they browse to a different site and then go back to OWA it will not prompt them to login. It looks like it is using some type of cached credentials. 
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I have users that access their e-mail VIA OWA. Recently it has been brought to my attention that when they logout of OWA using the log out button it does not actually log them out. If they browse to a different site and then go back to OWA it will not prompt them to login. It looks like it is using some type of cached credentials. 

Can't logout of OWA

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.