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OST to ICS Converter for Java Applications

Intuitive Java API to convert email files between formats. OST to ICS conversion code sample and its integration with Java projects.

Convert OST to ICS using Java API

Aspose.Email for Java provides an efficient and reliable solution for converting email files between various formats. It simplifies the process of email format conversion by providing a straightforward and efficient API. Try the concise and straightforward code sample that demonstrates the ease and efficiency of the email format conversion process. The code represents classes and methods for creating objects and manipulating them enabling developers to handle email data with ease and precision and achieve reliable and accurate results.

With the Java API, you don’t have to worry about complex algorithms or tedious manual work, saving time and effort for more important tasks to take your email processing applications to the next level.

How to Install Aspose.Email for Java Library

To start utilizing the capabilities of the powerful and feature-rich Java API is easy with one of the following actions:

  • download its latest version from Maven

  • 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>

In case of difficulties or questions regarding the installation process of the API, please visit the Installation section of our documentation .

How to Convert OST Files to ICS Format

Converting OST files to ICS format using Aspose.Email for Java simplifies email data management. With Aspose.Email’s API, developers can easily extract email content from OST files and convert it to ICS format for better calendar compatibility ensuring the integrity of the original email data, including event details, attendees, and reminders. This streamlined process ensures a smooth transition and enhanced data portability across various platforms. Incorporating Aspose.Email into Java applications enables efficient email management and scheduling.

To convert OST files to ICS format, the library offers the PersonalStorage class which is used to open a storage file, allowing access to its content and structure. The FolderInfo class represents a folder within the storage file and makes it possible to manipulate its content. The MapiMessage class provides developers with a comprehensive set of functionalities to work with email messages programmatically, enabling them to efficiently manage, manipulate, and interact with email data within their Java applications. The MapiCalendar class represents a calendar item extracted from the loaded MapiMessage. It provides properties and methods for working with calendar-specific data, such as appointments, events, and reminders. The AppointmentSaveFormat enum is used to export and share calendar data. In the code sample below, these classes work together to extract calendar items from an OST file, convert them into the .ics format, and save them as individual files in the specified output directory. For more information about the API high code features, please visit our reference resources .

Steps to Convert OST to ICS via Java

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

  1. Open the OST file using PersonalStorage.fromFile method.
  2. Make sure the output directory exists by creating a new File object using the outputDirectory path and calling mkdirs().
  3. Get the Appointments (Calendar) folder from the OST file using getPredefinedFolder .
  4. Iterate through the messages in the Calendar folder using a for loop and msg variable.
  5. Inside the loop, check if the message is a calendar item with MapiItemType.Calendar and if so, convert it to a MapiCalendar object.
  6. Save the calendar item as an .ics file in the output directory by calling the save method.

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 ICS - Java

// Open the OST file
PersonalStorage ost = PersonalStorage.fromFile(ostFilePath);
// Ensure the output directory exists
new File(outputDirectory).mkdirs();
// Get the Appointments (Calendar) folder from OST
FolderInfo calendarFolder = ost.getPredefinedFolder(StandardIpmFolder.Appointments);
// Iterate through OST messages and save calendar items as .ics files
int count = 1;
for (MapiMessage msg : calendarFolder.enumerateMapiMessages()) {
// Search a calendar view and save it as .ics file
String icsFilePath = outputDirectory + File.separator + "Message" + count + ".ics";
if (msg.getSupportedType() == MapiItemType.Calendar) {
    MapiCalendar calendar = (MapiCalendar) msg.toMapiMessageItem();, AppointmentSaveFormat.Ics);
System.out.println("Message " + count + " saved as: " + icsFilePath);

What is OST File Format?

OST (Offline Storage Table) file format is a file that stores a copy of mailbox items from an Exchange server, allowing users to access their mailbox data even when they are offline. OST files are synchronized with the Exchange server when a connection is established, ensuring that any changes made offline are updated on the server as well. OST files are used by Microsoft Outlook for email, contacts, calendars, tasks, and other mailbox items in an Exchange environment.

What is ICS File Format?

The ICS (iCalendar) file format is a widely used standard for storing and exchanging calendar and scheduling information, including events, tasks, appointments, and reminders. The ICS file format uses a human-readable text-based structure that contains details such as event title, description, location, start and end times, and participant information, allowing users to easily share and import calendar data across different platforms and applications.

File Format Conversions supported by Aspose.Email for Java

Aspose.Email for Java offers an extensive set of file format conversions designed to seamlessly handle emails, contacts, calendars, attachments. It empowers developers to effortlessly manipulate and transform data to meet the diverse needs of their applications. Implementing file format conversions in email applications facilitates their interoperability and elevates efficiency. Overall, the library supports conversion from EML , EMLX , ICS , MBOX , MHTML , MSG , OFT , OLM , OST , PST , VCF to other formats elevating user experience.
  • OST to ICS Conversion Live Demos

    Other Supported Conversions

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

    OST TO EML (Outlook Email Messages)
    OST TO EMLX (Apple EMLX Format)
    OST TO HTML (Hyper Text Markup Language)
    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)