
Microsoft Outlook saves mailbox data into PST files. Most users have multiple PST files over time, either from backups, account migration, archived emails or Outlook upgrade. Managing multiple PST files can be a struggle, making it difficult to search emails, organize folders and be productive.
Here a trustworthy PST Merge Tool can be of great help. With the help of a PST Merger, you can easily merge multiple PST files into a single Outlook data file without losing emails, contacts, calendars, notes, tasks, and folder hierarchy.
In this comparison guide, we will review the Top 7 PST File Merge Tools and compare their features, pros, cons and pricing to help you choose the right solution.
Quick Comparison Table

1. GainTools PST Merge
GainTools Merge PST is a small program for combining several Outlook PST files without disturbing the original structure of the mailbox. It supports ANSI and Unicode PST files and works with all modern versions of Outlook.
Features
Combine several PST files
Folder hierarchy preservation
Supports password protected PST files
ANSI & Unicode PST Compatible
Easy to use interface
Compatible with all versions of Outlook
Benefits
Simple to Use
Quick merging process
Preserves email format
Supports large PST files.
Rates low
Disadvantages:
Windows only software
Limitations of trial version
Price
$39 and up (pricing may differ by license).
2. SysTools PST Merger
SysTools PST Merge Software is a Professional tool that suits for individuals and businesses. It merges Outlook PST files without duplication of mailbox data.
Characteristics
Combine multiple PST files
Delete duplicate emails
Combine contacts, calendars, tasks, and journals
Support for password protected PSTs
preserves folder hierarchy
Benefits
Very dependable
Duplicate elimination feature
Advanced filter options
Enterprise-customers optimized
Cons
It costs more than some of the competitors
Interface can appear advanced for beginners
Cost.
Professional License starts at $49.
3. Softaken PST Merge
Softaken PST Merge Tool is an easy way to merge Outlook PST files without affecting the integrity of the mailbox. It is suitable for home users and IT professionals.
Features
Unlimited PST files merge
Save Attachment
Works with all versions of Outlook
Interface user friendly
Batch processing
Benefits
Simple installation
Quick processing
Keeps the folder structure
lightweight app
Disadvantages
Only for Windows platform.
Trial version has export restrictions
Cost
Starting at $29.
4. Stellar Merge for Outlook
Stellar is among the most popular names in Outlook management software. Its PST Merge tool merges mailbox files without changing email properties.
Features
Combine multiple Outlook PST files
Combine contacts and calendars
The deleted items are:
Preview before merge
Unicode PST support
Advantages
Well known brand
Great user interface
Performance consistency
Technical support is good
Drawbacks
High-end pricing
Some advanced features are available in higher editions
Price
Prices start at about $49-$59,
depending on the edition.
5. Aryson PST Merge
Fast Merge Outlook PST files, keep Mailbox Data Safe using Aryson PST Merge Software.
Function
Merge password protected PST
Unicode support in PST
Combine e-mail, contacts, tasks and journals
Maintains folder structure
Compatible with Win OS
Advantages of
Easy-to-use interface
Fast merge
Original data retained
Supports large PST files
Disadvantages
Trial version limited
No Mac version.
Starts at around $39.
6. DataVare PST Merger Expert
DataVare Outlook PST Merge is designed for the users who need a safe and fast way to combine multiple Outlook PST files. The software has a simple interface and supports all the major editions of Outlook.
Characteristics
Combine multiple PST files
Manage Outlook Archives
Keep folder hierarchy
ANSI & Unicode PST support
Batch merge function
Compatible with Outlook 2021, 2019, 2016, 2013, 2010 & Earlier Pros
Friendly for beginners
Fast merge
Preserves mailbox integrity
No data alteration
Handles large PST files
Drawbacks
Windows Only Application
Demo has restrictions
Cost:
Pricing from $29-$39.
7. PST kernel merge
Kernel PST Merge is a complete Outlook management tool for both personal and corporate users.
Characteristics
Combine many PST files
Merge password protected PST
Supports big Outlook files
Preserve folder hierarchy
Unicode compatibility
Wizard-compatible
Benefits
Dependable performance
Fast merge engine
Supports the latest Outlook versions
Pros Professional technical support
more expensive than some alternatives
Limitations of the trial version
Cost
Professional License starts at around $49.
Choose the Best Merge PST Software
It depends on your requirement to choose the best PST Merge Tool. Things to consider before you buy:
1. User Friendliness
Select a program that has a simple, easy-to-use interface, especially if you're not tech-savvy.
2. Compatibility with Outlook
Make sure it supports your version of Microsoft Outlook and Windows.
3. Large PST file support
If you work with large Outlook files choose software that can merge large PST files without performance issues.
4. Data accuracy
The software shall contain:
Emails Attachments
Contact Us
Calendar
Notes
Works »
Folder structure
Metadata
5. Bulk Processing
Batch merge is a great time saver if you are working with multiple Outlook archives.
6. Customer Assistance
For long-term usability, reliable technical support and regular software updates are important.
7. Budget
Compare features offered with price. There are some cheap tools that offer almost the same functionality as premium solutions.
Conclusion
Handling more than one Outlook PST file can be a struggle especially if you are a professional with a huge email archive. A reliable PST Merge Tool helps you to manage mailbox easily by merging multiple PST files into one well organized Outlook data file with intact data integrity.
The tools discussed above, GainTools Merge PST, Softaken PST Merge, and DataVare PST Merge Expert are good options for users looking for inexpensive and easy to use tools. SysTools or Kernel PST Merge may be better for businesses that need advanced features such as duplicate removal and enterprise-level functionality.
If possible download the trial version before you buy, to test the software and make sure that it is suitable for your specific needs.
FAQs
1. What is the PST Merge Tool?
GainTools Merge PST Tool is software that allows to merge multiple Outlook PST files into single PST file without disturbing the mailbox data and folder hierarchy.
2. Is it possible to merge password protected PST files?
Yes. Most of the professional PST merge applications support password protected PST files.
3. Will my email attachments be saved?
Yes. Good PST merge software preserves the email attachments, metadata, formatting, and folder structure during the merge.
4. Can I merge PST files without Outlook?
Most professional tools are made to work with Outlook PST files and might need Outlook compatibility. For details, see the software's system requirements.