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Duplicate calendar items on Outlook 2011 and iPhone

Posted on 2011-02-15
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Last Modified: 2012-06-21
Hello all,

I have a user who is set up with an Exchange mailbox on an SBS2008 server running Exchange 2007. The user has their calendar shared to someone who makes changes to the calendar from a Windows 7 pc running Outlook 2010. The user also has the Exchange mailbox connected to an Outlook 2011 for Mac client using RPC over HTTP as well as ActiveSync on their iPhone. Don't know if this matters as well but the user also has a MobileMe account only syncing contacts on the iPhone to the MobileMe cloud. The problem is that the user is getting duplicate and multiple calendar items in their iPhone and Outlook 2011 for Mac client. From what I've seen I haven't noticed any duplication/multiplication of the calendar items on the Outlook 2010 for PC client, so I believe that it's only occuring on the Mac and iPhone. Any ideas here guys? Would appreciate any assistance.
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Expert Comment

by:AsifC
ID: 34903257
Are any of the duplicates reoccurring events? Were they modified when the duplicates showed up?
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Author Comment

by:Leverage IT Consulting
ID: 34903295
I believe the duplicates are reoccurring. It doesn't look like they were modified though.
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Expert Comment

by:_13
ID: 34910249
Root Cause:
Exchange Active Sync issue.

Solution:
1. Open user mailbox profile using MFCMapi.
2. Go to directory Exchange Active Sync.., shift+delete all phones (no data loss will occur)
3. Go to calendar folder, sort by date or subject, shift+delete duplicates.
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Accepted Solution

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Leverage IT Consulting earned 0 total points
ID: 35030328
Found out it was MobileMe causing duplicate items in calendar. Disabled MobileMe calendar to resolve issue. Thanks for the help guys.
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Author Closing Comment

by:Leverage IT Consulting
ID: 35067607
Selected my own solution due to troubleshooting on my own,
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