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Written By Rohit Singh
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Updated on July 16th, 2025
Experiencing problems with the Outlook Cleanup Feature in Outlook? Well! You are not alone. An organized Outlook mailbox plays a crucial role in managing emails efficiently. In this blog, we will cover multiple solutions to resolve the Outlook cleanup not working issue. And, also present a recommended Cigati Outlook Duplicate Remover. The tool acts as an alternative to Outlookâs built-in Cleanup feature. We will also walk you through various manual troubleshooting methods that are cost-effective. Now, keep on reading the blog to better understand the entire process in detail.
The Outlook Cleanup Tool is a built-in feature in Microsoft Outlook that helps users declutter their Outlook mailboxes. It removes duplicate email messages from conversations and folders. It does:
The Cleanup feature is used to remove redundant or duplicate email messages in email conversations. But some common reasons can prevent it from working properly. These are:
Now, after learning about the reasons that prevent it from functioning properly, let’s move ahead. In the section below, we will explore the solutions to fix the issue.
If Outlook Cleanup is not removing duplicates, it could be due to corruption in the data file. Fix the corruption issue first, and then retry the cleanup process.
Use the following steps to proceed:
| C:\Program Files (x86)\Microsoft Office\root\OfficeXX\ |
By reducing the Outlook mailbox size, it can improve the performance and try to restore the functionality of the cleanup tools.
These are the steps to reduce the mailbox size:
Below are the steps to fix the Outlook Cleanup Tool not working:
The Cigati Outlook Duplicate Remover is a powerful solution that helps users easily find and delete duplicate emails from the Outlook data file (PST). Before any deletion, the tool provides a preview of the PST file details, helping users verify the details. One of its key features is to filter duplicate emails based on specific date ranges. It also offers a smart option to remove attachments from duplicate emails. Users can also customize the criteria used to detect duplicates.
Outlook mailbox cleanup issues can sometimes become frustrating, especially when handling duplicates and large files. Although Outlook offers built-in cleanup options that provide basic support, the duplicate remover offers a comprehensive solution. The tool helps remove duplicates with precision. By following the recommended steps, users can effectively fix the Outlook cleanup not working issue.
Ans: Some of the reasons could be, corrupted Outlook data file (OST/PST), configuration issues, flagged or unread messages, large mailboxes, software glitches or bugs, etc. All of this would lead to performance issues in the Outlook application.
Ans: The best methods include fixing the corrupted Outlook data file, reducing the mailbox size, etc. For a reliable and quick solution to the issue, we recommend using the Cigati Outlook Duplicate Remover.
About The Author:
Rohit Singh is an Email Backup, Recovery & Migration Consultant and is associated with Software Company from the last 3 years. He writes technical updates and their features related to MS Outlook, Exchange Server, Office 365, and many other Email Clients & Servers.
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