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How to do not import duplicate emails/contacts/calendars in Outlook?

Author: Kelly Last Modified: 2017-03-31

Let’s say you are importing emails from a PST file of one email account to another in Outlook, some emails might be duplicate. So how could you import excluding the duplicates? This article will introduce two solutions for you.

One click to delete all duplicate emails from a mail folder in Outlook

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arrow blue right bubble Do not import duplicate emails/contacts/calendars from PST file

When importing a PST file by the Import and Export Wizard in Outlook, you can prevent from importing duplicate emails, contacts, or calendars with checking the Do not import duplicates option in the Wizard. Please do as follows:

1. Click File > Open & Export > Import/Export (or File > Open > Import) to open the Import and Export Wizard.

2. In the Import and Export Wizard, please click to select the Import from another program or file option, and click the Next button.

3. Now in the Import a File dialog box, please click to select the Outlook Data File (.pst) option, and click the Next button.

3. In the Import Outlook Data File dialog box, (1) please click the Browse button to specify the PST file you will import; (2) check the Do not import duplicates option; (3) click the Next button.

4. In the second Import Outlook Data File dialog box, (1) specify the folder of the PST file you will import, (2) choose the destination email account you will import the PST file to, (3) click the Finish button. See screenshot:

So far, the specified PST file has been imported excluding all duplicate emails, contacts, and calendar items, etc.

arrow blue right bubble Remove duplicate imported emails/contacts/tasks with Kutools for Outlook

Sometimes, you may import emails with copying and pasting directly, or you forget to check the Do not import duplicates option within the Import and Export Wizard. In these situations, you can remove duplicated imported emails/contacts/tasks with Kutools for Outlook.

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1. After importing emails/contacts/tasks in Outlook, keep selecting the destination folder, and click Kutools > Duplicate Mails, or Kutools > More > Duplicate Contacts/Duplicate Tasks as you need. See screenshot:

Note: In my case, I click Kutools > Duplicate Mails.

2. In the popping out Duplicate Mails dialog box, please click the Delete button directly.

3. A dialog box will come out and tell you how many duplicate items have been removed. Please click the OK button to close it.

So far all duplicate emails have been removed from the selected folder already.


(1) For removing duplicate contacts, please select the contact folder, and click Kutools > More > Duplicate Contacts. See screenshot below:

(2) For removing duplicate tasks, please select the task folder, and click Kutools > More > Duplicate Tasks. See screenshot below:

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Demo: Remove duplicate imported emails/contacts/tasks in Outlook

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