Problem: The Outlook Web App used by Exchange 2010 has a feature where all of your “conversations” are grouped together for easier reference. This is nice when you have a lot of emails between you and another user and would like to see the conversation in one view instead of trying to find all of the emails. Some users, I have found, do not like this new view and want it back to the old way.
Solution: Within the outlook web app, click on “View” in the menu and then uncheck the “User Conversations” option. This will then bring your view to a more traditional look.