Easy Solution to Delete Duplicate Emails from Heavy PST Files

Microsoft Outlook is utilized by most offices & professionals today. Outlook PST files get bigger with time, & duplicate emails start to pile up. That renders managing emails challenging, slows down Outlook, & wastes storage.

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In this blog, we'll learn how to remove duplicate emails from large PST files, using both manual methods & professional third-party tools.

Why are duplicate emails created?

• Repeated import/export of a PST file
• Multiple accounts or sync errors
• After restoring a backup
• Incorrect IMAP/POP account settings

Method 1: Outlook Duplicate Email Removal Very Simple

You may render use of Outlook's built-in features if there aren't many duplicate emails.

Step 1: Use the clean-up tool.

• Open Outlook
• Select a folder or conversation
• Click Home > Clean Up > Clean Up Folder/Conversation\
• Outlook will automatically remove duplicate messages

Limitations:

1. This method is slow for large PST files.
2. Only removes exact duplicates.
3. Does not work with contacts, calendars, & attachments.

Step 2:- Avoid Duplicates When Importing

• File > Open & Export > Import/Export
• Select “Import from another program or file.”
• Select the PST file.
• Select the “Do not import duplicates” option.

This method only works during import; it does not remove existing duplicates.

Method 2:- Third-Party Outlook Duplicate Remover Tool (Professional Solution)

Professional Outlook Duplicate Remover is a perfect tool for a PST file that is quite huge (10GB, 20GB, or more) & includes many duplicate emails.

You can safely remove all types of duplicate items from Outlook PST files with the use of GainTools Outlook Duplicate Remover. Even big PST files can be processed with ease by this program, which also eliminates duplicate data without causing any harm to the original data.

Key Features of Outlook Duplicate Remover Software

• Removes duplicate emails, contacts, calendars, & tasks
• Supports single and multiple PST files
• Fast and secure process for large PST files
• Identifies duplicates based on subject, sender, date, and attachments
• Preview option before deletion
• Original data completely protected
• Compatible with all Windows and MS Outlook versions

How does Outlook Duplicate Remover work?

• Install and launch the software
• Add a PST file or folder

• Select duplicate criteria

• See a preview after the scan is complete

• Remove duplicate items or save them to a new PST

This process is very simple & requires no technical knowledge.

Conclusion
The Outlook manual method might be effective if your PST file is short & contains few duplicates. However, the Outlook Duplicate Remover Tool is the fastest, safest, or most efficient approach for large PST files & professional settings.

Regular duplicate removal improves Outlook's performance & keeps your email data organized.

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