How to split large PST files in Outlook?

[Anand-Kashyap]

To divide large PST files in Outlook, the best option is the Regain PST Splitter Tool. This user-friendly software assists you in dividing large PST files into smaller, manageable parts, enhancing Outlook functionality. You can divide files by their size, date range, or sort them according to sender, recipient, or subject customizing the division to your requirements. The tool guarantees that all crucial information, including attachments, timestamps, and email headers, is retained, preserving the integrity of your emails. It is compatible with both UNICODE and ANSI formats, functioning smoothly with every version of MS Outlook and Windows OS. Thanks to its intuitive interface, Regain PST Splitter simplifies and streamlines the management of large email files. For both personal and professional purposes, it offers a trustworthy, affordable option for managing substantial PST files securely and rapidly.

 

[pear]

Using a professional application like Softaken Split PST application is a dependable solution if you want to split large PST files in Outlook. Without running the risk of data loss or damage, this software helps you divide large PST files into smaller, more manageable parts. Emails, attachments, contacts and calendars can all be divided by size, year or folder using a variety of settings while maintaining the original data structure. The application is a useful option for maintaining Outlook efficiency and smoothness because it supports all Outlook versions, works with both ANSI and Unicode PST formats and has an intuitive user interface.

 

[monor]

Splitting large Outlook PST files is frequently required because they can lead to corruption or slow performance. Although Outlook does not offer a direct split option, you can manually manage data by creating smaller PST files using the Import/Export Wizard or the Archive feature.

These techniques take a lot of time, though, and are impractical for very large mailboxes. An expert solution such as the BLR PST converter tool is a more effective way to split PST files by size, date, or folder while maintaining attachments, metadata, and folder structure, guaranteeing seamless Outlook operation.

 

[BeverlyGarcia]

I had the same problem with a very large PST file in Outlook, and what worked for me was using the GainTools Split PST Tool. Without erasing any data & it enabled me to split my large PST into smaller files according to size and year. My Outlook now functions much more smoothly after the short and simple operation. Before you buy, you can also test this software out for free.

 

[Ethankoles]

The most efficient method to split a PST file is by using the Shoviv PST Splitter, it is designed to divide oversized PST files into smaller parts safely. Large PST files often cause slow performance or corruption, and this tool helps prevent such issues by offering multiple splitting options, including size, folder, and date-based criteria. With its simple interface, even non-technical users can split PST files without difficulty. The tool maintains complete data integrity, preserving emails, contacts, calendars, attachments, and folder structure during the process. It supports both ANSI and Unicode PST files and works with all Outlook versions. Users can also try the free demo to evaluate the tool before purchasing.

 

[zacharywalker]

You can split large PST files in Outlook using an automated tool like Mailvita Split PST for Mac, which makes the process quick and error free. Instead of manually creating several PSTs and moving objects around, which risks damage or data loss, the it application divides large PST files by size, date, folder or even some email categories. It supports both ANSI and Unicode PST files, ensuring data integrity, including attachments and folder hierarchies. The interface is basic enough for non technical users and because it runs natively on macOS, it is a dependable choice for managing Outlook data on a Mac.

 

[Khushi Singh]

If you’re dealing with a large PST file in Outlook, you’re not alone—this is a prevalent issue, especially for users who rely on Outlook for years without regular maintenance. When a PST file becomes too large, Outlook may become slow, freeze, or even stop opening.

Why you should split a large PST file​

Outlook has size limitations (around 20 GB for older versions and 50 GB for newer ones). Once a PST crosses the safe limit, problems like corruption, frequent crashes, and sync errors start appearing. Split PST File into smaller parts is one of the safest ways to fix this without losing emails.

Manual options (and their limitations)​

You can try methods like:

• Archiving emails by date
• Moving emails to another PST file manually
• Using Import/Export in Outlook

However, these methods are time-consuming, require technical knowledge, and don’t give much control over splitting criteria. There’s also a risk of data inconsistency if Outlook crashes mid-process.

Best solution: Use a Split PST Tool​

If you want a quick, safe, and professional solution, using a dedicated Split PST Tool to Split PST File is highly recommended.

A reliable PST Splitter tool allows you to:

• Split large PST files by size, date, year, or folder
• Maintain original email structure and metadata
• Handle very large PST files without Outlook performance issues
• Avoid data loss or corruption
• Work with all major Outlook versions

Many tools also offer a free version so you can test the splitting process before purchasing, which is helpful if you want to verify accuracy.

Why I recommend using a PST Splitter tool​

From experience, automated tools save hours of manual effort and significantly reduce the risk of Outlook errors. Instead of struggling with Outlook’s limitations, a Split PST tool does the job cleanly and efficiently—especially useful for business users or anyone managing years of email data.

Bottom line:

If Outlook is slowing down or your PST file is too large, splitting it using a professional Split PST Tool is the safest and most efficient approach. It keeps Outlook stable and ensures your email data remains intact.

Hope this helps!