If your Outlook PST files have become very large and Outlook is working slowly, then I would definitely recommend trying DataVare Outlook PST Compact Expert Tool. I have used it myself, and it compresses many of my large PST files very quickly, that too without any data loss.

Its special features include:
Compress multiple PST files in batch mode
Option to compress attachments or save them separately
Supports password-protected PST files as well
User-friendly interface

The best part is that it does not require Outlook to be installed!
If you are also having trouble with Outlook data management, then definitely try it once.

If you are struggling with managing multiple PST files in MS Outlook, then MailsDaddy PST Merge and Join Tool can be your perfect solution. This utility allows users to merge unlimited PST files into one without compromising the original folder hierarchy or data integrity. The tool supports all Outlook versions, including the latest editions, and works seamlessly on Windows platforms. One of the most useful features is its ability to exclude duplicate emails during the merge process. Additionally, it does not require Outlook installation for joining PST files. This makes it not only efficient but also convenient for users who want a quick and reliable way to organize their Outlook data files.

Download Free Demo: https://www.mailsdaddy.com/pst-merge-and-join/

I had multiple PST files in my Outlook that had become very large, which slowed down my system. Compacting manually was time-consuming, so I tried a few tools. I found Softaken Compress PST Software to be the best. It compressed many of my large PST files without deleting any data. Space can also be saved by separating attachments.

Easy interface
Fast process
Batch compression
If your PST files are too large, then you should try this tool.