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Written By Evren Cole
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Updated on July 23rd, 2025
MS Outlook is a desktop-based email service provider quite popular among huge organisations and professionals. It is used by many individuals who face issues of inaccessible PST files due to exceeding storage limits and errors because of oversized PST files. So here we will be describing the various methods that can reduce Outlook PST file size without losing any data. Therefore, read this blog to the end to find the methods, which include how to shrink Outlook PST files with and without Outlook.
There are various procedures to compress a PST file with the help of Outlook’s built-in features and without it. So let’s move forward to learn the secure and easy-going methods to reduce the size of a PST file in Outlook.
MS Outlook has a built-in feature to compact PST files so let us first learn this process without any delay.
This is another built-in feature provided by Outlook that can reduce the size of your PST files, so follow the mentioned steps below.
These are two manual methods that Outlook provides to compact the size of a .pst file. However, the above procedures are quite time-consuming, and there are chances of heavy data loss on any manual mistake. Moreover, sometimes users face issues like misplacement of information while performing these methods. Therefore, we have also included a professional approach to reduce PST file size without Outlook.
PST Compact Tool is an astonishing tool that allows you to compress Outlook PST files with reliability and 100% data integrity. It offers a very user-friendly interface that helps non-technical users easily operate this tool. Using this software, you can easily compress multiple PST files simultaneously with attachments. One of the benefits of this utility is that it supports PST files created by all versions of Outlook.
To reduce PST file size, we have included various procedures that can efficiently compact the size of any PST file with ease. Manual methods can compress PST data using different features of MS Outlook. However, these methods are quite risky if you have multiple files to compress. Therefore, we have also included a professional solution that offers you a safe and secure process of compression of Outlook PST files in bulk. Well, it’s up to you to choose any of the above solutions.
Also Read: Outlook PST Cannot be Found.
A: The safest way is to use Outlook’s built-in Compact Now feature after deleting unnecessary items. This compresses the PST file without deleting any data that remains in your folders.
A: Yes. You can archive old emails, move items to a new PST file, or compress the PST file using “Compact Now” to reduce size without deleting data.
A: Yes. Archiving moves older emails to a separate PST file, effectively reducing the size of your main Outlook data file while preserving all data.
About The Author:
Evren Cole is an expert in Email and Data Management. She has a strong passion for technology and entrepreneurship. In her free time, she enjoys football, music, and reading books.
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