Mails dissappeared in the inbox after transition from exchgange 2003 to 2010

Question: -
Hi

We did a transisition from exchange 2003 to 2010 and  migrated all mail boixes  to 2010.

I have a problem with one of the user and when i log into owa i cant see any emails the inbox.
If i go to the mailbox and properties of the user and there it says
Total items 500
Size(KB)is  4001.

I tried to send a test mail to this account  and i  wheni logged in as the user in OWA i can see the test email. But i dont know why its not showing the old emails when i login to owa.

Thanks
Solution: - 
PietMuis -- In OWA 2010 you can apply filters, there is a filter called unread - maybe that is applied? 
pcsmitpra - You need to make sure that the account that runs the restore job(which can be set manually) has full permissions to the Exchange server, Information Store, and User's Mailbox.

Try this : - go to the user Inbox  folder -> properties -. Security -> Advance -> Owner -> Select owner -> Select "replace" ->Apply -> ok

This will over write the permissions on old files, and Exchange will have permission on all 

PietMuis -- have you tried opening the mailbox as an administrator?
What about moving it back to 2003? - then export to pst and create a new mailbox on 2010.

sorry i do not know the solution just some ideas... 
Logon to an PC with your exchange admin account and setup outlook for the user.

To do the import/export look here
http://www.msexchange.org/articles_tutorials/exchange-server-2010/management-administration/exporting-importing-mailboxes-exchange-server-2010.html