I recently faced the same issue — my PST file had grown so large that it started causing problems, and to make things worse, I didn’t have Outlook installed. I tried searching for manual methods but none worked without Outlook. Then I found the SysTools PST Splitter tool.

It turned out to be a lifesaver! The tool let me split my huge PST file into smaller, more manageable parts easily. I didn’t need Outlook, and all my emails and attachments stayed safe. If you’re in the same situation, I’d definitely recommend trying SysTools PST Splitter — it made the whole process effortless.

For Better Information - https://www.systoolsgrou...ook-2016-2013-2010-2007/ 

If you want to split PST file then you can archive old data. This is an easiest and simple way to reduce PST file size. However, if your PST is very large then you can use MailsDaddy PST split tool to divide in two or more PSTs.

Splitting a large PST file without using Outlook is definitely possible, and it’s often the best approach when Outlook becomes slow, unresponsive, or unable to open oversized data files. Since Outlook doesn’t provide a built-in option for splitting PST files, many users rely on external methods to prevent corruption and improve performance. A practical way to do this is by using a dedicated PST splitter tool that can divide your file into smaller, more manageable parts. One solution designed for this task is the Cigati Split PST Tool , which lets you split PST files by size, date, folder, or email ID. If you want a step-by-step guide covering multiple methods, you can also refer to this detailed article: How to Split PST Files Without Outlook . These approaches make it easy to manage large PST files without needing Outlook installed.