Two calendar, contact, task, journal items in outlook2007

We are an organization using Exchange 2003. One of our employees has suddenly two of all these items in his outlook view:
calendars, contacts, tasks, journals, notes, RSS Feeds

He is using several computers and they are all present there as well as on the webmail which means they are on the server.
If he receives meeting requests and accepts them they appear in his new calendar and not in the original one which got all of his "old/current" appointments.

when I rightclick om the calendar I get the choice to delete the old one but not the new calendar. The same happens to all of the other items.
Why has this happend and how can I remove all of these new items? And why is all new meeting request appearing in his new calendar?
mintraasAsked:
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tntmaxConnect With a Mentor Commented:
If the problem follows the user into OWA, then you should really check the integrity of the store. Start with ISINTEG to see if there are any problems.

http://www.msexchange.org/tutorials/Exchange-ISINTEG-ESEUTIL.html
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