Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17


Outlook 2013 - contact duplicated in Outlook, but not on Windows Phone or at

Posted on 2013-06-10
Medium Priority
Last Modified: 2014-11-12
Several weeks ago I updated from Outlook 2010 on my primary computer (Windows 8)  to Outlook 2013 (Office 365).  Previously, contacts and calendar were synchronized with my Windows Phone (7.5) via my Microsoft Account (,,  During the first few weeks, all was fine until June 7, 2013, when I noticed that all my contacts in Outlook had been duplicated, but that is the only location showing duplicates.  All is fine in the "cloud" and on my Windows phone.  I deleted the Exchange ActiveSync account from Outlook to "reset the shot clock."  When I reestablished the Exchange ActiveSync account, all was fine, no duplicates.  An hour or so later, I checked and the contacts had been duplicated again.  No problems with the calendar entries.  So, what might be causing the contacts to be duplicated and how do I resolve the issue?  Many thanks in advance for technical insight!
Question by:bbaumberger
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
LVL 26

Expert Comment

by:Blue Street Tech
ID: 39250556
Hi bbaumberger,

I would first off call Microsoft Support. If it is a business account you should have free support.

When are you noticing the duplicate contacts? Are you seeing them in the same contact folder? Can you provide a screenshot? Can you duplicate this on another machine?

Typically, this is a delegate issue I've seen in Exch 2010 but not in 2013. When there are issues with the server you will tend to see them spawn into OWA and other devices, so when you say you "reset the clock", the procedure for doing so can be accomplished multiple ways. Make sure you follow these steps to remove your Outlook Profile. Close Outlook, go to Control Panel > click on Mail. In the Mail dialogue box select the default profile and click Properties > Data Files and select the default data file and click Open File Location. Once in the directory, highlight and delete all contents.

WARNING: This assume you are fully sync'd with Exchange.

Then click Close on the Account Settings dialogue box, close the Mail Setup dialogue box. Now remove the profile in the Mail dialogue box by selecting the profile and clicking Remove. Click OK and reboot your PC.

Once rebooted setup your Outlook profile. Let me know how it goes. Thanks!

Author Comment

ID: 39250703
I also posed the question to Microsoft Support, and they, too, recommended the recreation of my Outlook profile.  Although my contacts and calendar are synchronized across platforms via an Office 365 Exchange account, my profile includes several email accounts, a mix of old POP accounts and IMAP.  Due to upcoming commitments, I will not recreate the Outlook profile until mid-July 2013, at which time, I will convert my entire email environment to  full Outlook Exchange and IMAP as appropriate for improved cross-platform functionality.  I will update this problem report at that time.  Thanks for your advice.
LVL 26

Expert Comment

by:Blue Street Tech
ID: 39252320
I hear you...I used to be there...with multiple accounts on various platforms so I totally understand not wanting to just "re-create" your profile, but I was able to streamline and do some other things to consolidate my accounts and man its better, simpler and when issues come up you can just strip it down and build it up quickly. Thanks for the update. I look forward to working with you on this. Talk to you then!

Accepted Solution

bbaumberger earned 0 total points
ID: 39306069
I've been traveling for a few weeks, the reason for my delayed response.  The duplicate contact problem occurred on my desktop computer.  When traveling, I often copy my Outlook.pst file to my laptop computer, something I did recently.  Interestingly, when I copied the Outlook.pst file back to my desktop computer, the duplicate contact issue was resolved - no more duplicates.  I had been expecting to create a new Outlook profile, but will not do so since the simple task of copying the Outlook.pst file to another computer, then back to the desktop computer resolved the issue - a very pleasant surprise!

Author Closing Comment

ID: 39320154
I am accepting my solution as the best one because it resolved the issue without extra effort.  Thanks to all who contributed their suggestions!

Featured Post

On Demand Webinar: Networking for the Cloud Era

Ready to improve network connectivity? Watch this webinar to learn how SD-WANs and a one-click instant connect tool can boost provisions, deployment, and management of your cloud connection.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

How to resolve IMCEAEX NDRs in Exchange or Exchange Online related to invalid X500 addresses.
This article will help to fix the below errors for MS Exchange Server 2013 I. Certificate error "name on the security certificate is invalid or does not match the name of the site" II. Out of Office not working III. Make Internal URLs and Externa…
This Experts Exchange video Micro Tutorial shows how to tell Microsoft Office that a word is NOT spelled correctly. Microsoft Office has a built-in, main dictionary that is shared by Office apps, including Excel, Outlook, PowerPoint, and Word. When …
Want to learn how to record your desktop screen without having to use an outside camera. Click on this video and learn how to use the cool google extension called "Screencastify"! Step 1: Open a new google tab Step 2: Go to the left hand upper corn…

722 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question