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+--- Thread: How to Compress Oversized PST Files to Prevent Corruption? (/showthread.php?tid=44830)
How to Compress Oversized PST Files to Prevent Corruption? - Thomaswilson081 - 11-22-2025
I urgently need some guidance. I manage multiple Outlook PST files for my office team, and a few of them have grown beyond 15–20GB. Recently, Outlook has started lagging and showing occasional error prompts, which I suspect might be due to the oversized PST files. I am worried that if the file sizes continue to increase, they may get corrupted. Can anyone suggest the safest and most effective ways to compress or reduce the size of large PST files?
RE: How to Compress Oversized PST Files to Prevent Corruption? - donnaperez - 11-22-2025
If your Outlook PST file has grown too large and is repeatedly experiencing slow performance or corruption errors, the DataVare Outlook PST Compact Expert Tool is an excellent solution. This tool safely compresses large PST files without any data loss and significantly improves Outlook's speed. I've used this software to manage oversized PST files, and the results were quite impressive. Most importantly, it doesn't damage emails, contacts, calendars, or any other data while compressing the PST. Its different compression modes are also useful, especially the feature that saves attachments to a separate folder.
Key Benefits
Safely compresses oversized PST files
Increases Outlook's speed and performance
Option to extract attachments separately
Compatible with all Outlook versions
No data loss, no corruption risks
I suggest using this program if Outlook is regularly hanging or crashing and your PST file is 10GB+, 20GB, or more. The PST size is much decreased in a matter of minutes, & the UI is easy to use.
This is a really helpful utility for users who want to keep Outlook running smoothly and error-free.
Blog:- https://www.datavare.com/how/reduce-outlook-pst-files/