outlook client marks all responses to an email as unread emails

I have a user complaining that she has a situation where email responses get marked as unread email, and she checks all of them thinking its a new email.

example:

User reads all her email and has 0 unread emails being indicated.  
User sends an email to 10 people and 5 people respond.  She now has 6 unread emails, the original email, plus all the responses.  
She opens all of them and gets back to 0 unread emails.  
1 more person responds, and now all 6 prior emails become unread again, plus the last response means 7 unread emails.  

Why does it have to mark all of the emails in the entire chain as unread when one person responds?  

Can this be changed, turned off...etc?
icecom4Asked:
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JohnBusiness Consultant (Owner)Commented:
User ... has 0 unread emails ...  User sends an email ...  She now has 6 unread emails including the original

1. Try an Office Repair (Control Panel, Programs and Features, click on Office and do a Full Repair).

2. If no, check and repair the PST file with SCANPST (scanpst.exe is in the Outlook Program folder).

3. If problem continues, try a new, test Windows User Profile (account) and try Outlook in the new account.

Please see my article on Outlook Problems and Repairs.

http://www.experts-exchange.com/articles/18375/Outlook-Errors-Problems-and-Repairs.html

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