• Outlook User
  • New Outlook app
  • Outlook.com
  • Outlook Mac
  • Outlook & iCloud
  • Developer
  • Microsoft 365 Admin
    • Common Problems
    • Microsoft 365
    • Outlook BCM
    • Utilities & Addins

Duplicate Appointment Remover Tools

Slipstick Systems

› Tools & Utilities › Duplicate Remover Tools › Duplicate Appointment Remover Tools

Last reviewed on July 29, 2020     4 Comments

Applies to: Outlook (classic), Outlook 2007, Outlook 2010

This page contains utilities that automate the removal of duplicate appointments.

If the duplicate appointments are the result of importing, you can add the modified date field to the view and sort by it, then delete appointments based on the modified dates. When the cause of the duplicated appointments is PDA synchronization one of the utilities listed below is generally the easiest method to remove duplicates.

If you imported duplicates from the Outlook holiday file, see To remove duplicate holidays from the Calendar folder in Microsoft Outlook

Many of these tools will remove duplicates from any Microsoft Outlook folder type, however, if you are looking for tools to remove duplicated contacts or mail items, you may want to look at the tools on the following pages as well. Note that some of the duplicate contact tools have the ability to merge duplicated contacts.

More Information | Remove Duplicate Contacts | Remove Duplicate Messages

 

Tools in the Spotlight

4Team Duplicate Killer

Outlook Duplicate Killer is an add-in for Microsoft Outlook. Find, merge and remove Outlook duplicates. Compare, assign the category, flag and move duplicates to selected folders. Find and remove duplicate contacts, emails, calendar events, tasks and notes automatically. Manage duplicates in any Microsoft Outlook folder, including Microsoft Exchange and Public folders. Preview duplicate search results prior to processing. New Duplicate Killer has improved user interface. Now account name and folder path are display.

Duplicates Remover for Outlook

Delete duplicate contacts, notes, tasks, journal and calendar items in Microsoft Outlook folders and Exchange Server folders. Duplicates can be marked, copied or moved to any folder. It supports searching across the folders. Supports all versions of Outlook, including Outlook 2007/2010. Version 2.6

ReliefJet Essentials for Outlook

ReliefJet Essentials is a set of 162 utilities for Outlook, Office 365 and Exchange Server. It can backup, import, export and convert data into different formats. Perform personalized mass mailings. Save, remove and optimize attachments. Find and remove duplicate messages, contacts, appointments, meetings, and other items. Retrieve statistics on email usage and get reports on Outlook data and settings. You can run the utilities directly from Outlook, automatically in rules, via standalone app, or from the command line.

Tools

1-Click Duplicate Delete

1-click solution to remove duplicate mails, contacts or calendar items. Merges contacts automatically, has an undo function and a configurable advanced mode. Version 3.03 Now supports Outlook 2010 (both 32 and 64 bit).

4Team Outlook Duplicate Remover

Duplicate Remover will find, merge and remove duplicates in 3 steps using simple search wizard. Search duplicate items and merge Outlook duplicates automatically. Review & merge duplicate Outlook contacts. Remove Outlook Inbox duplicates, duplicate Contacts and Calendar events, Junk contacts. Quickly clean up all your contacts. Application can now be started as a standalone, without starting Microsoft Outlook. Scan Outlook inbox automatically and clean duplicates in one click. Now delete duplicates for multiple folders.

Deduper - Outlook Duplicate Remover

Deduper does exactly as the name suggests, it searches and removes all duplicates - including appointments, contacts, notes, tasks or emails.

Delete Duplicates for Outlook

Delete Duplicates for Outlook deletes duplicate e-mails. Detect and remove duplicate messages, contacts, calendar items, tasks, journal entries and notes. Compare messages by content (Standard), by part of the content (Special) or by unique message-id's (Light). Compare attachments and/or embedded files, by name and/or by content. Compare duplicates across several mailboxes or in within the boundaries of individual mailboxes. Use Regular Expressions. Works with all Outlook versions, inc. Outlook 2010/2013 32 or 64-bit.

Duplicate Appointments Eliminator

The Duplicate Appointments Eliminator allows you to either delete all the duplicates or move them to a folder of your choice. Comparisons of two appointments (optionally) based on subject, location, start time, end time, body, categories, recurrences, and required attendees. Works with Exchange public folders or other shared folders and you can choose to operate on a single folder or select many folders at once. Works with Microsoft Outlook 2007, Outlook 2003, Outlook 2002 and Outlook 2000.

Kernel for Outlook Duplicates Remover

Kernel for Outlook Duplicates Remover tool is specifically programmed to remove duplicate items of MS Outlook permanently. The tool easily locates all duplicate Outlook items and provides option to either manage them or remove them permanently. The tool supports removal of duplicate items for all MS Outlook versions. Its free trial version can remove 10 items from each folder and expires after 30 days of download.

NoMoreDupes for Outlook

NoMoreDupes detects and removes all duplicated Outlook items both in an Outlook pst file, a public folder or in an Exchange account. It shows the found duplicates in a preview for the user to decide which duplicates to remove. You can move the duplicated Outlook items to your "Deleted Items" or to any other folder you specify. NoMoreDupes uses a special algorithm to detect the Outlook duplicates. This Outlook-Add-In works with all versions of Outlook, including Outlook 2010/2013 64bit.

Outlook Duplicates Remover

Removes duplicate items from Calendar, Tasks, Contacts, Notes, and mail folders. Free.  

Stellar Duplicate Remover

Clean up your Outlook mailbox from unwanted and duplicate emails with Outlook duplicate remover tool. This software works as an Add-Ins in Outlook and removes duplicates as per different time span and scan criteria. Customized operations like Mark as Expired or Flag, Delete Permanently, Copy to folder and more are also a notable feature of this software.

More Information

Microsoft Outlook Calendar Issues
Synchronize mailbox and Public Folders -- includes tools to copy appointments from public to mailbox folders

Other calendar tools are on the following pages:
Calendar Tools for Schedule Management
Calendar Reminder Tools for Microsoft Outlook
Calendar Printing Tools for Outlook
Calendar Dates and Other Data for Outlook
Time and Billing Tools for Outlook Calendar
Meeting Productivity Tools for Outlook

For Group Calendar tools, see Maintaining a Group Calendar in Outlook.
Web Publishing tools: Publishing Microsoft Outlook Calendars on the Internet or an Intranet

Duplicate Appointment Remover Tools was last modified: July 29th, 2020 by Diane Poremsky

Related Posts:

  • Delete Duplicate Outlook Contacts
  • This is a collection of tools for the Microsoft Outlook Calendar folde
    Calendar and Meeting Tools
  • Duplicate Remover Tools
  • This is a collection of tools for the Microsoft Outlook Calendar folde
    Calendar Tools for Outlook

About Diane Poremsky

A Microsoft Outlook Most Valuable Professional (MVP) since 1999, Diane is the author of several books, including Outlook 2013 Absolute Beginners Book. She also created video training CDs and online training classes for Microsoft Outlook. You can find her helping people online in Outlook Forums as well as in the Microsoft Answers and TechNet forums.

Subscribe
Notify of
4 Comments
newest
oldest most voted
Inline Feedbacks
View all comments

MBS (@guest_205451)
March 23, 2017 10:46 pm
#205451

Hi Dianne
We need an Exchange dedup tool that will run across up to 50 accounts - does your tool do that?
Also does it delete if 2 or more appointments exist with the same start time, end time and subject? If so how does it know which one to keep?
Thanks
MBS

0
0
Reply
Diane Poremsky(@diane-poremsky)
Author
Reply to  MBS
March 23, 2017 11:59 pm
#205452

I know many of the dedup tools are available with corporate licenses, but they are outlook addins and are installed on each computer.

They will remove two identical appointments - most let you select fields to check, but checking date/time and subject would be the default, you could include Notes field. I'm not sure which one gets deleted, the newest or oldest - but if they are identical, it won't matter. :) Some of the tools, like ReliefJet, can categorize the ones it identifies as duplicates, which makes it easier to spot check.

1
-1
Reply
MBS (@guest_205450)
March 23, 2017 10:44 pm
#205450

Hi Dianne
We need an Exchnage dedup tool that will run across up to 50 accounts - does your tool do that?
Also does it delete if 2 or more appointments exist with the same start time, end time and subject? If so how does it know which one to keep?

1
-1
Reply
Diane Poremsky(@diane-poremsky)
Author
Reply to  MBS
March 24, 2017 12:04 am
#205453

BTW - there is a powershell script in technet but i don't know if it works on all items, including appointments or only on all mail - the notes say all folders.
https://gallery.technet.microsoft.com/office/Removing-Duplicate-Items-f706e1cc/

1
-1
Reply

Visit Slipstick Forums.
What's New at Slipstick.com

Latest EMO: Vol. 30 Issue 19

Subscribe to Exchange Messaging Outlook






Support Services

Do you need help setting up Outlook, moving your email to a new computer, migrating or configuring Office 365, or just need some one-on-one assistance?

Our Sponsors

CompanionLink
ReliefJet
  • Popular
  • Latest
  • Week Month All
  • Jetpack plugin with Stats module needs to be enabled.
  • Open Outlook Templates using PowerShell
  • Count and List Folders in Classic Outlook
  • Google Workspace and Outlook with POP Mail
  • Import EML Files into New Outlook
  • Opening PST files in New Outlook
  • New Outlook: Show To, CC, BCC in Replies
  • Insert Word Document into Email using VBA
  • Delete Empty Folders using PowerShell
  • Warn Before Deleting a Contact
  • Classic Outlook is NOT Going Away in 2026
Ajax spinner

Recent Bugs List

Microsoft keeps a running list of issues affecting recently released updates at Fixes or workarounds for recent issues in classic Outlook (Windows).

For new Outlook for Windows: Fixes or workarounds for recent issues in new Outlook for Windows .

Outlook for Mac Recent issues: Fixes or workarounds for recent issues in Outlook for Mac

Outlook.com Recent issues: Fixes or workarounds for recent issues on Outlook.com

Office Update History

Update history for supported Office versions is at Update history for Office

Outlook Suggestions and Feedback

Outlook Feedback covers Outlook as an email client, including Outlook Android, iOS, Mac, and Windows clients, as well as the browser extension (PWA) and Outlook on the web.

Outlook (new) Feedback. Use this for feedback and suggestions for Outlook (new).

Use Outlook.com Feedback for suggestions or feedback about Outlook.com accounts.

Other Microsoft 365 applications and services




New Outlook Articles

Open Outlook Templates using PowerShell

Count and List Folders in Classic Outlook

Google Workspace and Outlook with POP Mail

Import EML Files into New Outlook

Opening PST files in New Outlook

New Outlook: Show To, CC, BCC in Replies

Insert Word Document into Email using VBA

Delete Empty Folders using PowerShell

Warn Before Deleting a Contact

Classic Outlook is NOT Going Away in 2026

Newest Code Samples

Open Outlook Templates using PowerShell

Count and List Folders in Classic Outlook

Insert Word Document into Email using VBA

Warn Before Deleting a Contact

Use PowerShell to Delete Attachments

Remove RE:, FWD:, and Other Prefixes from Subject Line

Change the Mailing Address Using PowerShell

Categorize @Mentioned Messages

Send an Email When You Open Outlook

Delete Old Calendar Events using VBA

Repair PST

Convert an OST to PST

Repair damaged PST file

Repair large PST File

Remove password from PST

Merge Two Data Files

Sync & Share Outlook Data

  • Share Calendar & Contacts
  • Synchronize two computers
  • Sync Calendar and Contacts Using Outlook.com
  • Sync Outlook & Android Devices
  • Sync Google Calendar with Outlook
  • Access Folders in Other Users Mailboxes

Diane Poremsky [Outlook MVP]

Make a donation

Mail Tools

Sending and Retrieval Tools

Mass Mail Tools

Compose Tools

Duplicate Remover Tools

Mail Tools for Outlook

Online Services

Calendar Tools

Schedule Management

Calendar Printing Tools

Calendar Reminder Tools

Calendar Dates & Data

Time and Billing Tools

Meeting Productivity Tools

Duplicate Remover Tools

Productivity

Productivity Tools

Automatic Message Processing Tools

Special Function Automatic Processing Tools

Housekeeping and Message Management

Task Tools

Project and Business Management Tools

Choosing the Folder to Save a Sent Message In

Run Rules on messages after reading

Help & Suggestions

Submit Outlook Feature Requests

Slipstick Support Services

Buy Microsoft 365 Office Software and Services

Visit Slipstick Forums.

What's New at Slipstick.com

Home | Outlook User | Exchange Administrator | Office 365 | Outlook.com | Outlook Developer
Outlook for Mac | Common Problems | Utilities & Addins | Tutorials
Outlook & iCloud Issues | Outlook Apps
EMO Archives | About Slipstick | Slipstick Forums
Submit New or Updated Outlook and Exchange Server Utilities

Send comments using our Feedback page
Copyright © 2025 Slipstick Systems. All rights reserved.
Slipstick Systems is not affiliated with Microsoft Corporation.

wpDiscuz

Sign up for Exchange Messaging Outlook

Our weekly Outlook & Exchange newsletter (bi-weekly during the summer)






Please note: If you subscribed to Exchange Messaging Outlook before August 2019, please re-subscribe.

Never see this message again.

You are going to send email to

Move Comment