How to Compress or Compact Outlook PST File in 2026

Anshu_123

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Compressing or compacting an Outlook PST file can be done manually using Microsoft Outlook’s built-in Compact feature. First, open Outlook and go to File > Account Settings > Account Settings. From the Data Files tab, select the PST file you want to compress and click Settings. Then, click on the Compact Now button to reduce the file size. Outlook will start compacting the PST file by removing unused space. However, this manual method has several limitations. The compacting process is slow for large PST files and may take a long time to complete. In some cases, Outlook may freeze or crash during the process, especially if the PST file is oversized or slightly corrupted. Additionally, users must repeat this process for multiple PST files one by one, which is time-consuming and not practical for managing large mailboxes.

To simplify this process, you can use the Cigati PST Compress Tool, which provides a quick and reliable way to compress Outlook PST files without data loss. This tool reduces PST file size by compressing emails and attachments while preserving folder hierarchy and data integrity. It supports bulk compression of multiple PST files at once, saving significant time and effort. The software also offers options to remove duplicate emails and compress attachments selectively, helping you free up more storage space. With the Cigati PST Compress Tool, you can easily manage oversized PST files and improve Outlook performance without technical complications.
 
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