Outlook Duplicate Items Remover

Martin Brinkmann
Oct 24, 2009
Updated • Nov 30, 2012
Email, Microsoft Outlook, Windows software

There are several possibilities why duplicate items can appear in Microsoft Outlook including mail retrieval errors or importing data from another source like Gmail or another email program. Duplicate items take up space and can be cause for all kinds of errors and confusion.

The Outlook Duplicate Items Remover is a free program for the Windows operating system that can clear - or to be more precise move - duplicate items in Microsoft Outlook. It scans the Outlook contacts, notes, appointments, tasks and emails for duplicate items. This is done by comparing specific variables. For email contacts to be duplicate for example they need to match the first name, last name, company name and email address.

The Outlook software moves all duplicate items into the ODIR_duplicate items folder where they can be processed further. The program works quite well although some Outlook users might find it a bit to limiting as there is no way to change the variables that are compared to find duplicates. Outlook Duplicate Items Remover would for instance fail to find a duplicate contact entry if the name and company matches but not the email.

Outlook users can download Outlook Duplicate Items Remover from the developer's website.

Please note that the program is only compatible with 32-bit versions of Microsoft Outlook, and not with 64-bit versions of Office or Outlook. As long as you have a 32-bit version installed, even on a 64-bit system, you are fine to use the program.

The latest tested version is fully compatibly with Outlook 2010. No word yet on compatibility with Outlook 2013 which has just been released by Microsoft.


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  1. Marshal said on September 7, 2012 at 10:51 am

    A Duplicate email in outlook is a very common issue for Outlook users and sometimes it creates confusion to identify original mail. So it is good idea to remove duplicate email from the Outlook through Stellar Phoenix Outlook Duplicate Remover.

  2. vijayalakshmi.j said on July 6, 2012 at 8:02 am

    pls open the gmail

  3. arnold said on August 25, 2011 at 3:45 am

    I’m glad to have found this add-in. ‘Works great! Thanks!

  4. gerald kane said on December 2, 2010 at 11:09 pm

    do i or do not delete outlook duplicates

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