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Not really the answer I was looking for since I despise IMAP
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Check your version of 2016.<br />
<a href="http://www.lifehacker.com.au/2016/03/outlook-2016-pop3-bug-deletes-and-duplicates-emails/" rel="ugc">http://www.lifehacker.com.au/2016/03/outlook-2016-pop3-bug-deletes-and-duplicates-emails/</a><br />
<a href="http://answers.microsoft.com/en-us/office/forum/office_2016-outlook/outlook-2016-office-365-duplicate-emails-after-new/2a59cd1a-1d51-4683-a144-d7d66a4811ee/?rtAction=1456362388633&auth=1" rel="ugc nofollow">http://answers.microsoft.com/en-us/office/forum/office_2016-outlook/outlook-2016-office-365-duplicate-emails-after-new/2a59cd1a-1d51-4683-a144-d7d66a4811ee/?rtAction=1456362388633&auth=1</a>
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Yes found out that the newest update of 2016 has this issue...no fix as of yet.
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Hello all,<br />
I was using Outlook 2007 for several years and had no issues with my POP3 email accounts. &nbsp;<br />
I decided last week to purchase Office 2016 Professional. &nbsp;Installed with no issues.<br />
The issue that I am having is that every email I now receive in Outlook 2016 I get three copies of within a 10 minute time frame.<br />
Again I am using POP3 accounts and never had this issue with Outlook 2007.<br />
Is there a setting in Outlook 2016 that I am not aware of to fix this?<br />
Have not really found much on the internet about this type of issue.<br />
Thanks,<br />
Kelly W.
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Hello all,
I was using Outlook 2007 for several years and had no issues with my POP3 email accounts.  
I decided last week to purchase Office 2016 Professional.  Installed with no issues.
The issue that I am having is that every email I now receive in Outlook 2016 I get three copies of within a 10 minute time frame.
Again I am using POP3 accounts and never had this issue with Outlook 2007.
Is there a setting in Outlook 2016 that I am not aware of to fix this?
Have not really found much on the internet about this type of issue.
Thanks,
Kelly W.

Outlook 2016

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.