Outlook is a popular choice for managing your calendar because it offers many tools to help you stay organized. On the other hand, managing multiple similar calendar data can complicate and confuse users. We will walk you through the steps in this guide to remove or delete duplicate calendars in Outlook. Now, let’s move on.

Microsoft offers MS Outlook which is a popular personal information manager. Outlook supports performing a variety of tasks including calendar scheduling, task management, contact organization, and email sharing.

Outlook’s calendar function makes it easy for users to plan events, meetings, and appointments. With Outlook users can swiftly create, modify, and view appointments, set reminders, and share the calendar with others.

When using Outlook for calendar management, some users may encounter Outlook calendar duplication issues.

Duplicate calendars in Outlook refer to the occurrence of multiple calendar folders or entries. These duplicates can clutter the calendar view, leading to the inability to schedule and manage appointments.

Also Read: – How to Remove Duplicate Emails from OST/PST file in MS Outlook?

Reasons for Calendar Duplication in MS Outlook: –

Duplicate calendars in Microsoft Outlook can stem from various reasons, including: –

  • Problems with Syncing: Incorrect synchronization between Outlook and other programs or devices might result in redundant calendar entries.
  • Importing Data: importing calendar data from other sources, such as CSV files or other calendar apps, sometimes becomes the reason for duplicate Outlook calendars.
  • Software Glitches: Outlook software flaws or malfunctions, can cause Calendar duplication. Updates, conflicts with other programs, or problems with the Outlook application itself are some of the major reasons.
  • User Error: In some cases, users may inadvertently create duplicate calendars by copying or moving calendar items within Outlook.

Best Automated Outlook Calendar Duplicate Remover solution

eSoftTools Outlook Duplicate Remover software is a solution that simplifies the process of Outlook calendar de-duplication. It effectively searches and removes duplicate calendar events from data files PST and OST files.

A robust and easy-to-use tool to remove calendar duplicates and also delete duplicate contacts, emails, tasks and other Outlook mailbox items. Using sophisticated algorithms and a user-friendly interface, this tool makes it easy for users to organize Outlook calendar data without any mistakes.

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How to Delete Duplicate Calendars in Outlook with Outlook Duplicate Remover?

  • Download and install the eSoftTools Outlook Duplicate Remover software on your Windows computer.
  • Press the “Select PST or OST file” button and choose your preferred file-adding mode:
    • Add Single PST or OST file: Search for or add a single data file (PST/OST).
    • Add Multiple PST or OST files: Add multiple data files or add a folder at once.
  • Import your data files and click the “Start Scanning” button to scan them.
  • After scanning, view the Outlook items loaded from the data files.
  • Choose the required folders containing duplicate items and press the “Remove Duplicates” button.
  • Select the “Calendar” from the available options to search for and remove duplicates.
  • Choose between searching for duplicates within the folder or across folders.
  • Click on the “Browse” button and choose a location to save the resultant file.
  • Finally, click on the “Remove Duplicates” button and begin the calendar duplicates erasing process.

Advanced Features of Outlook Duplicate Remover tool: –

  • Smart Duplicate Detection: – The program carefully checks Outlook PST files to find and delete duplicates of mailbox items – emails, contacts, calendars, tasks and more.
  • Preview Duplicate Items: – Users can easily compare and verify duplicate items directly from the data files in the software before removing them, ensuring proper removal.
  • Safe Removal Process: – This tool uses sophisticated algorithms to guarantee the safe removal of duplicate items without losing the integrity of Outlook data.
  • Customizable Scanning Options: – Depending on their preferences, users can change the scanning options to include or exclude specific folders, date ranges, and item types.
  • Batch Processing: – With batch processing, users can scan and remove a large number of duplicates from multiple data files at one time to save time and effort.
  • Multiple Item Types: – The tool can identify and eliminate duplicate emails, contacts, projects, notes and other Outlook items, in addition to calendars.
  • User-Friendly Interface: – The user-friendly interface of the software makes it suitable for both inexperienced and experienced users.
  • Compatibility: – The software works with OST and PST files of all MS Outlook versions including Outlook 2021, 2019, 2016, 2013, 2010 and previous editions.


Outlook duplicate calendars might be confusing and inefficient for your workflow. However, duplicate calendars are simple to find and eliminate if you use the above-given instructions. Make use of eSoftTools Outlook Duplicate Remover software, which is a reliable and effective way to get rid of duplicate calendars in Outlook. This software helps keep your Outlook environment clutter-free and streamlines calendar management.

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