Exchange2013 upgrade from Echange 2010 calendar problems

After upgrade to exchange 2013 from Exchange 2010 30% off all users have 2 or more calendar inn Outlook 2010 .
 
if the have calendar inn exchange 2010 they get kalender (Norway) and calendar in exchange2013.

If the have Kalender(Norway) inn exchange 2010 the get calendar and Kalender in exchange 2013
audunturAsked:
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Rick HobbsRETIREDCommented:
If no help, look into this:

http://support.microsoft.com/kb/2509983

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