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  3. Merger
  4. OST

Merge OST Files

Upload 2 OST files to merge emails. You can view, download or send the combined result as email

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Merge and combine multiple email files into a single EML, MBOX, PST, MSG or OST document. With Email Merger App you can easily review, share, send or print the result file. Merger App has a flexible interface to create your own scenarios of merging message files. You can change the resulting file format and the order of merger emails.

Aspose.Email SDKs allow you to process emails in different ways, one of them is merging email files. Merge Outlook, Thunderbird, G Suite and many other email file formats without additional apps installed.

All our online Apps are secure, fast, reliable, easy to use and absolutely free. You can add these features to your app with Aspose.Email SDKs. Have a closer look at Aspose.Email documentation to get more details on how to use it.

In case you are interested in the development of professional high-performance email-orientated software solutions, take a look at our Cloud approach. Aspose.Email Cloud SDKs provide you with creating, processing, reading, sending and receiving, manipulate email files, also combining email files and more other easy to use functions for almost all programming languages.

In case you are interested, also take a look at all Aspose.Email products.

OST Outlook Offline Storage File

MBox file format is a generic term that represents a container for collection of electronic mail messages. The messages are stored inside the container along with their attachments. Messages from an entire folder are saved in a single database file and new messages are appended to the end of the file. Numerous applications and API provide support for MBox file format such as Apple Mail and Mozilla Thunderbird. Also, OST files can be converted to other message containers and used in other applications. For example, you can use an OST to PST converter.


How to merge OST files

  • Click inside the file drop area to upload an email file or drag & drop an email file.
  • Click the 'MERGE' button to start merging files.
  • Instantly download, view or send merged file as an email.
  • You can also send a link of merged files to your email address.
  • Note that file will be deleted from our servers after 24 hours and download links will stop working after this time period.


  • ❓ How can I merge email files?
    With Aspose.Email Merger you can merge email files online. First, you need to add a file for merge: drag & drop your Email file or click inside the white area to choose a file. Then click the "Merge" button. When Email merging is completed, you can download your result file.
  • 🗂 Which email formats can I merge?
    Email Merger works with EML, MSG, MBOX, OST, PST.
  • 🛡️ Is it safe to merge Emails using free Aspose.Email Merger?
    Of course! The download link of result files will be available instantly after merging. We delete uploaded files after 24 hours and the download links will stop working after this time period. No one has access to your files. File merging is absolutely safe.
  • 💻 Can I merge emails on Linux, Mac OS or Android?
    Yes, you can use free Aspose.Email Merger on any operating system that has a web browser. Our Email Merger app works online and does not require any software installation.
  • ✅ Can I use Aspose.Email Merger in my projects?
    Absolutely! Aspose.Email provides a high-performance API. Using Aspose.Email you can convert, view, edit and process emails in the way you need. You can use one of its SDKs on your platform or use Email Cloud approach, which is safety, fast and reduces the load on your system.