How to reduce the size of a PST file without an email client like Outlook?

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ellaward commented
If your Outlook PST file has become too big and Outlook is running slow or not loading, I would like to suggest a great tool – Softaken Compress PST Tool. I have used it myself and it is very easy and fast.
With this you can:
Compress PST file without any data loss
Save attachments in a separate folder
Batch compress multiple PST filesWhat I liked most is that it does not require Outlook. The interface is simple and is great for non-tech users as well.
Read More:- https://www.datavare.com/software/outlook-pst-compact-expert.html
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James Luther commented
Using the Softaken Compress PST Program, you can easily compress Outlook PST files using the PST compressor features. This program compresses huge PST files, increasing storage capacity. Both the ANSI and UNICODE formats are supported by this tool. However, all attachments are removed and compressed using the Compress PST tool.
This tool can be used rapidly with all major versions of Windows 7, 8, 10, 11, XP/Vista, and Outlook. Microsoft Outlook in 2003, 2016, 2013, 2007, and 2021 as well. This tool's ability to operate independently without requiring the Outlook email client is one of its advantages. If you are already familiar with the functionality of the product, install the trial version to learn more about it. Even a non-technical operator can use its features because they are so simple.
Read More: https://www.softaken.com/compress-pst-pro