Compress OST format using C#

OST Compression Overview

With Aspose.ZIP for .NET, you can compress OST email files using a clean, fully managed C# API for server and desktop workflows. You can process individual files or collections, use streams for I/O, and tune compression levels to match storage and transfer needs. This is useful for archiving mailboxes or message exports. Archive OST data into ZIP, 7Zip, TAR, GZIP, and more with no third-party tools; encryption and password protection are available for sensitive content. This makes automation straightforward for build pipelines, backups, or content distribution workflows.

  PM> Install-Package Aspose.ZIP

C# Example: Create a ZIP Archive from OST Files

The snippet below shows the core API steps to compress a OST file: create an Archive object, add the entry, and save the resulting ZIP.

Compress OST file via .NET:

    var dir = "full directory path";
    using (var arch = new Archive())
    {
    arch.CreateEntry("filename.ost", dir+"file.ost");
    arch.Save(dir+"archived_result.zip");
    }

FAQ

Can I compress multiple OST files into a single ZIP archive using C#

1. Yes. Aspose.ZIP for .NET allows you to load and compress multiple OST files by adding each file as an entry to the Archive object. You can combine individual files, folders, or streams into a single ZIP archive through a straightforward C# workflow.

Does Aspose.ZIP for .NET reduce the original quality of OST files?

2. No. Aspose.ZIP performs lossless compression, meaning that the content and quality of your OST files remain unchanged. The library only reduces file size by applying efficient archive compression algorithms without altering the actual data inside the file.

Can I password-protect ZIP archives that contain OST files?

3. Yes. The library supports password protection and AES encryption, allowing you to securely package sensitive OST files. You can specify encryption settings when creating entries or during the archive-generation process.