Cigati PST and OST Compress Tool is a reliable solution to reduce the size of Outlook PST and OST files without losing any data. Large mailbox files can cause slow performance, storage issues, or even corruption. This tool helps users compress and manage their Outlook data more efficiently.

With its easy-to-use interface, the software allows you to remove, extract, or save attachments from Outlook files while keeping emails safe and accessible. It ensures that the folder hierarchy, email formatting, and metadata remain intact after compression.

Key Features of PST and OST Compress Tool

Compress PST & OST Files Efficiently
Reduce the size of large PST and OST files while preserving all emails, attachments, calendar entries, contacts, metadata, and folder structure.

Batch Compression Support
Process multiple PST and/or OST files in one go. Ideal for organizations needing to manage many user archives.

Selective Compression via Filters
Compress only specific folders, date ranges, or item types (e-mails, contacts, calendar, etc.), so you don’t have to compress everything if not needed.

Maintain Data Integrity
All email metadata (From, To, Subject, Date, etc.) and attachments are preserved exactly; no data loss during compression.

Preview Before Compression
View what items will be compressed or excluded before processing starts. Ensures greater control and reduces risk.

Preserve Folder Structure & Hierarchy
The original structure of folders and subfolders is kept intact, making navigation post-compression seamless.

Compact & Archive Options
Offers “compact” mode for routine downsizing, and “archive” mode for moving older / less-frequently accessed items into separate, smaller archives.

Support for All Outlook Versions
Works with all modern Outlook versions (e.g., Outlook 2010, 2013, 2016, 2019, Microsoft 365), and supports large file sizes safely.

Why Rely on Cigati PST and OST Compress Tool?

• Speed and Performance: Designed to compress without slowing down your Outlook environment.

• User-Friendly Interface: Simple UI that non-technical users can handle, and powerful enough features for IT administrators.

• Reliability: Ensures no corruption, data loss, or compromise of email fidelity during the compression process.

• Flexible Usage: Whether for a single user or a large enterprise, scaling is smooth.

• Storage & Cost Savings: Smaller file sizes help reduce storage needs, improve backup/restoration times, and potentially lower infrastructure costs.

Use Cases

• Cleanup of bloated Outlook PST/OST files to restore performance.

• Archiving old emails to separate files for compliance and retention policies.

• Preparing PST/OST files for migration or backup where size limits exist.

• Organizations managing many user mailboxes are looking to reduce storage overhead.

Step-by-Step Guide to Compress Large PST and OST Files

Step 01: Download and install the Cigati PST and OST Compress Tool.

Step 02: Choose the file type – Outlook Data File (.pst) or Offline Storage File (.ost).

Step 03: Click Select File, browse for the PST/OST file, and then click Open to add it.

Step 04: Select the folders you want to compress and click Next.

Step 05: Customize the compression options or use additional features as needed.