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.

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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.

If you wish to split large PST file  without using Outlook, I personally utilized the DataVare Outlook PST Split Expert Tool and found it quite useful. It operates totally standalone, so no Outlook installation is required, which is a big benefit. You can separate large PST files by size, date, year or even folders, making it simple to manage large mailboxes. The UI is user friendly and even non-technical individuals can use it without difficulty. I used it to split a large PST into smaller sections without losing any emails, contacts or attachments and the folder structure was intact. For anyone suffering from large PST files and searching for a simple solution that does not require Outlook, this application is well worth trying.

You can split a large PST file without having Outlook installed by using a standalone solution like the MailsDaddy PST Split Tool . This tool works independently of Outlook and allows you to divide oversized PST files into smaller parts based on size, date, year, or folder while preserving all emails, attachments, and folder structure. It’s an easy and safe option for users who want to manage large PST files without relying on Outlook or risking data loss.

If you need to split a large PST file  without installing or using Outlook, you can try the Softaken Split PST Tool, which is designed to divide oversized PST files into smaller, manageable parts with complete data safety. The software allows you to divide PST files by size, date, year or selected folders and making it simple to organize huge Outlook files. Throughout the splitting process, it keeps the original folder hierarchy, email attributes, attachments, contacts, calendars and other mailbox contents. The application supports both ANSI and Unicode PST files and runs smoothly on all major Windows versions.