Sudden appearance of over 7000 unread emails on iphone

As I was clearing out my emails yesterday, I suddenly noticed over 7000 emails (marked as unread) in the inbox.  However, when I open the inbox, it says "no unread emails."  I also have no emails anywhere else (having deleted trash and junk mail).  I can find no way of eliminating that pesky number when I close the email.  Anyone have any suggestions?  I've read anything I can find, and nothing seems to be working.

Hi,
I am using Exchange 2010 server and iPhone 5, the same behavior as yours.
And I refresh the emails in iPhone 5 manually, the unreaded email becomes read.
I think it need some times to sync the changes.
If the status not changed after refreshing manually, I suggest use Windows Phone for test if it is convenient.
If it works in Windows Phone, I suggest asking iPhone support for help so that we can get more professional suggestions.
If it doesn't work in Windows Phone, since Office 365 is different from Exchange 2013 server, I suggest asking Office 365 Forum for help. For your convenience:
http://community.office365.com/en-us/default.aspx
Thanks
Mavis
Mavis Huang
TechNet Community Support

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