How Can I Make Outlook Data File Smaller?

kylendavid955 — Thu, 10 Sep 2026 10:30:57 +0000

A large PST file can make Outlook slower, especially when opening folders, searching emails, or loading attachments.

You can manually reduce the size by deleting unnecessary emails and attachments, archiving older data, or using Outlook’s Compact Now option. But these methods may not be suitable if you need to keep all your emails.

In that case, SysTools PST Splitter is a practical option. It can split a large Outlook PST into smaller files based on size, date, folder, or other criteria, while keeping the existing mailbox data intact.

If your PST has become too large, splitting it into smaller files can make it easier to manage and work with in Outlook. Always keep a backup of the original PST before making any changes.

How do I split a large Outlook PST file?

Abhilashdogra — Thu, 19 Jun 2025 09:37:49 +0000

Aryson PST Splitter Tool is the most reliable and effective utility for splitting multiple PST files into smaller parts. It doesn’t just split files—it also enhances security and control. After splitting, you can set passwords on the resulting PST files, which is essential if you're distributing them or storing them externally. The tool also preserves the folder structure and metadata of the original PST, so there's no confusion when accessing split files. Another useful feature is the ability to detect and eliminate duplicate emails during the split, which helps when you’re dealing with merged inboxes or overlapping PSTs. Apart from this, if anyone is concerned about the integrity and security of their Outlook data, this tool provides a clean, reliable, and secure way to manage oversized PSTs effectively.

PST Splitter — BeatMaker Forums

How Can I Make Outlook Data File Smaller?

How do I split a large Outlook PST file?