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Try this:<br />
<br />
Holding down the Ctrl key (the equivalent on a Mac), select all the duplicate entries that you want to delete from the Outlook Calendar.<br />
Once you have finished selecting all the duplicate entries, press the ‘Delete’ button<br />
<br />
Just note that if you have imported these, you most probably did not uncheck the allow duplicates box.
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Try this:

Holding down the Ctrl key (the equivalent on a Mac), select all the duplicate entries that you want to delete from the Outlook Calendar.
Once you have finished selecting all the duplicate entries, press the ‘Delete’ button

Just note that if you have imported these, you most probably did not uncheck the allow duplicates box.

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How to avoid this happen in future. I read from below articles they said that this is common problem for Outlook mac2011<br />
<br />
<a href="http://www.officeformachelp.com/2010/10/barrys-applescripts-for-office-2011-available-for-download/" rel="ugc">http://www.officeformachelp.com/2010/10/barrys-applescripts-for-office-2011-available-for-download/</a><br />
<br />
<a href="http://www.beato.com/2011/04/outlook-2011-sp1/" rel="ugc">http://www.beato.com/2011/04/outlook-2011-sp1/</a>&nbsp;
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How to avoid this happen in future. I read from below articles they said that this is common problem for Outlook mac2011

http://www.officeformachelp.com/2010/10/barrys-applescripts-for-office-2011-available-for-download/ [http://www.officeformachelp.com/2010/10/barrys-applescripts-for-office-2011-available-for-download/]

http://www.beato.com/2011/04/outlook-2011-sp1/ [http://www.beato.com/2011/04/outlook-2011-sp1/] 

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Our VIP calendar events seem have a duplicate items. It is possble to remove the duplicate calendar events.
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Our VIP calendar events seem have a duplicate items. It is possble to remove the duplicate calendar events.

Remove Duplicate Calendar event on Outlook 2011

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Apple Software

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.