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Calendar Events Duplicating in Outlook – Get Resolutions Here

Published By Mohit Jha
Nimisha Ramesh
Approved By Nimisha Ramesh
Published On February 3rd, 2023
Reading Time 5 Minutes Reading

We all know that Outlook calendar is an integral part of Microsoft Outlook personal information manager. It allows users to schedule appointments, meetings, and events, and can also be used to share calendar information with others. It can be accessed through the Outlook desktop application, as well as through a web browser or mobile device. It can be integrated with other Microsoft apps and services like Teams and To-Do, and it supports calendar sharing, meeting scheduling, and more.

Now, it provides this much facility, then a large number of users use the Outlook calendar program to maintain their day-to-day events and meetings. But among these users, there are some users who encounter the duplication issue of Outlook calendar items. So for those users here in this article, we are going to explain why calendar events duplicate in Outlook and how to resolve this issue. In a quick manner.

But before preceding the solution let’s find out why??

Reasons for Calendar Events Duplicating in Outlook

  • Synchronization Issues: If you are using Outlook in conjunction with another calendar application, such as Google Calendar or iCloud, there may be issues with the synchronization between the two, which can cause events to duplicate.
  • Corrupted Outlook Data File: If your Outlook data file is corrupted, this can cause events to duplicate.
  • Conflicting Calendar Entries: If you have multiple calendar entries for the same event, Outlook may not be able to distinguish between them and will create duplicates.
  • Third-party Add-ins: If you are using a third-party add-in for Outlook, it may be causing the events to duplicate.
  • Server Issue: In case you are connected to an exchange server, it may be a server issue that causes duplication of events.

Now after knowing the reasons let’s jump towards the solution part where we discussed the appropriate methods that can deal with this problem.

Instant Way to Remove Duplicate Calendar Events from Outlook

If you are facing calendar events duplicating in Outlook and had lots of duplicate files then you can try this tool to resolve this issue. Outlook Duplicate Remover is a software tool designed to help users remove duplicate emails, contacts, calendar events, tasks, journals, and notes.

The software can search for duplicates within a single PST file or across multiple PST files, and it allows users to specify which fields should be used to identify duplicates. Once duplicates have been identified, the software allows users to either delete them or move them to a specific folder.

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Additionally, it can remove duplicates from password-protected PST/OST/BAK files. It can remove duplicates from both PST and OST file formats. It is stand-alone software and does not require Outlook to be installed on the system. It is compatible with all versions of Outlook and Windows.

Working Steps of the Tool

1. To use teh tool first you have to download and install the tool on your machine.

2. Once the installation is completed open the tool and click on Add Files or Add Folder to add the PST file.

3. Choose the Destination location to save the duplicate free new PST file.

4. After this select the calendar option to remove the duplicate from it.

5. At last click on the Next button to start the procedure

6. Once the task is completed click on the OK button.

Manual Way to Fix Calendar Events Duplicating in Outlook

Here in this section, we are going to explain some free solutions that help you to fix this issue. So try them one by one.

Method 1: Check the Synchronization Issue

Make sure that the synchronization settings between Outlook and any other calendar applications you are using (such as Google Calendar or iCloud) are properly configured. Check all the settings of Outlook synchronization.

Method 2: Conflicting Calendar Entries:

As we said if you have multiple calendar entries for the same event, try to merge all the calendar data into one calendar data. It will help you to resolve this issue in the Outlook calendar.

Tool Tips

If you want to merge two or more two calendar data, then you can try PST File Merge Tool. The tool gives you the straightforward option to merge Outlook calendar data. To try the tool downlaod the demo version of the tool because it is totally free.

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Also Read: How to Combine Multiple PST Files into One Manually

Method 3: Check for Third-party Add-ins:

If you are facing calendar events duplicating in Outlook issue and want to resolve it, then check for the third-party add-in for Outlook, and try disabling it to see if it is causing the issue.


Calendar events duplicating in Outlook refers to the occurrence of multiple copies of the same calendar event or appointment in the Outlook calendar. This can happen for a variety of reasons. Hence to get rid of this issue we have come up with solutions. So, go through this blog post and resolve Outlook duplicate calendar issue.