Duplicate Calendar entries in Outlook 2010

Hi Guys,

I have a user that sometimes get duplicate entries in his calendar.  One is in the tentative state and the other is accepted.  If I look at his received emails he only received one invite to the specific meeting. It happens with multiple meeting organisers and not with all their invites. Any ideas in troubleshooting this will be appreciated? (The user is only using his PC to access his calendar/email, no smart devices)

Thanks
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PietMuisAsked:
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ChrisCommented:
you could use one of the new exchange tools

http://blogs.technet.com/b/exchange/archive/2012/02/22/calcheck-the-outlook-calendar-checking-tool.aspx

have a look at this and see if there are any errors that come up

you could also use the outlook configuration checker

http://blogs.technet.com/b/exchange/archive/2012/03/05/released-outlook-configuration-analyzer-tool-ocat.aspx
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PenguinNCommented:
Could be a bug, there are quite a lot of treats regarding outlook duplicate appointments. This artikle did it for me in the past, there is quite a lot information in there.
http://support.microsoft.com/kb/890436
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