If your PST file has become too large, then yes — splitting it into smaller PSTs is a good idea because oversized Outlook data files often slow down Outlook performance and can sometimes increase the risk of corruption.

You can use either the manual method or a professional PST splitter utility depending on your requirements.

Manual Method (Free but Time-Consuming):

You can create a new PST file in Outlook and manually move/export emails by year, folder, or date range. This works fine for smaller mailboxes, but for very large PST files it becomes lengthy and there’s always a chance of missing emails or breaking folder hierarchy if not done carefully. Reddit users also mention that manual exporting requires multiple passes and Outlook installation.

For a safer and faster approach, many users prefer dedicated PST splitter tools.
One reliable option is the FreeViewer PST Splitter. It can split PST files by:

• Size
• Date
• Year
• Folder
• Email ID
• Category

More Information - https://www.freeviewer.org/pst/splitter.html

The tool also preserves folder structure, emails, contacts, calendars, and attachments during the process. Another useful advantage is that it works even without Outlook installation. According to the official feature list, it supports both ANSI and Unicode PST files and can handle very large PST sizes safely.

I would personally suggest:

• Use the manual method only if your PST is small and you just need basic archiving.
• Use a professional utility like FreeViewer PST Splitter if the PST is very large, corrupted, or if you want a safer automated process without risking data loss.

Also make sure to keep a backup copy of the original PST before splitting it.

Thanks for the suggestions. I had a 57 GB PST file and was looking for a way to split it into smaller files, but couldn’t find a solution. This really helped me!

Whenever it comes with split PST file without Outlook or into smaller parts, always go for a trustworthy brand which is exist and serving from the long time. So, I feel you should go with the SysTools PST Splitter which comes with free demo version. It can easily split your all-large PST files without losing any data.

If your PST file has grown too large, splitting it is a good idea to improve Outlook’s performance and avoid data corruption.

You have two main options:

1. Manual Method (Free):
You can create new PST files in Outlook and move folders or emails manually. It's simple but time-consuming and lacks filtering options.

2. Third-Party Tool:
For a faster and safer option, I recommend the SysTools PST Splitter. It allows you to split by size, date, year, or folder and ensures no data loss. I’ve tried it after struggling with a few other tools that didn’t work properly.

If your PST is very large, using a professional tool is more efficient and reliable.

https://www.systoolsgroup.com/split-pst.html

Shoviv PST Splitter is a helpful tool for Microsoft Outlook users. It helps you to split PST files into smaller, more manageable parts. A PST file used by Outlook stores emails, contacts, calendars, and other data. When these files get too big, Outlook can slow down or not work correctly. That’s where this software comes in to break the PST file and resolve the problem.
This tool is easy to use, even if you’re not a tech expert. You can split PST files based on size, date, folder, or year.
Shoviv PST Splitter works with all versions of Outlook, including the latest ones. It also supports both ANSI and Unicode PST files. The software keeps your data safe and doesn't make any changes to the original file.
Whether you're an individual or an enterprise, this tool can save time and avoid problems with large Outlook files. It works fast and also performs tasks securely. If you want to keep your Outlook running smoothly, Shoviv PST Splitter is a wise choice.

Read Blogs: https://www.shoviv.com/blog/how-to-split-pst-file-in-outlook-manually/