I am managing Outlook PST files for my organization, and some of them have grown too large over time. I want to reduce their size without losing important emails. Can someone guide me on the best ways to delete old cache, temporary files, and junk to make PST files smaller? I am looking for practical steps or tools that can help clean up PST files efficiently.
Answers
If your Outlook frequently slows down or your PST file size becomes too large, the easiest solution is to remove old cache and useless junk items. Over time, Outlook accumulates various temporary files, auto-complete cache, sync issue logs, and junk emails, which increase the size of the PST file. If your Outlook PST file is repeatedly oversized and Outlook is running slowly, Softaken Compress PST Software is an excellent solution. This tool safely compresses junk, empty folders, deleted items, and attachments from large PST files, significantly reducing the file size. The advantage is that the integrity of the PST is completely preserved, and Outlook performance improves. Even non-technical users can easily compact an oversized PST file in just a few clicks. If you want to shrink a PST file without losing data, definitely try Compress PST Software.
John Brown
@john-brown
December 01,2025 At 01:29 PM
Solution #1