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Convert OST to EML in Java

Native OST to EML conversion using Java Email library, without needing any additional software.

How to Convert OST to EML Using Java

In order to render OST to EML, we’ll use

Aspose.Email for Java

API which is a feature-rich, powerful and easy to use conversion API for Java platform. You can download its latest version directly from


and install it within your Maven-based project by adding the following configurations to the pom.xml.


<name>Aspose Java API</name>
<version>version of aspose-email API</version>

Steps to Convert OST to EML via Java

Java programmers can easily convert OST file to EML in just a few lines of code.

  • Load OST file with PersonalStorage.fromFile.
  • Call the saveAs() method having two parameters.
  • Output EML file and FileFormat.Ost as parameters.
  • Open EML file in compatible program.

System Requirements

Before running the Java conversion code, make sure that you have the following prerequisites.

  • Microsoft Windows or a compatible OS with Java Runtime Environment for JSP/JSF Application and Desktop Applications.
  • Get latest version of Aspose.Email for Java directly from Maven .

Convert OST to EML - Java

PersonalStorage ost = PersonalStorage.fromFile("Outlook.ost");

FolderInfo folderInfo = ost.getPredefinedFolder(StandardIpmFolder.Inbox);

MessageInfoCollection miCol = folderInfo.getContents();

for (int i=0;i < miCol.size(); i++){

	MessageInfo msgInfo = (MessageInfo)miCol.get(i);

	MapiMessage mapi = ost.extractMessage(msgInfo);"DestFolder\\" + i + ".eml", SaveOptions.getDefaultEml());

  • OST to EML Conversion Live Demos

    Other Supported Conversions

    You can also convert OST into many other file formats including few listed below.

    OST TO EMLX (Apple EMLX Format)
    OST TO HTML (Hyper Text Markup Language)
    OST TO ICS (iCalendar)
    OST TO MBOX (Electronic Mail Messages)
    OST TO MHTML (Web Page Archive Format)
    OST TO MSG (Outlook & Exchange Format)
    OST TO OFT (Outlook Email Templates)
    OST TO PST (Outlook Personal Storage Files)
    OST TO VCF (Virtual Card Format)