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Convert OST files online instantly, no sign-up required. You can convert your OST documents on any platform—Windows, Linux, or macOS. Upload your file, choose the output format, and press convert. When the process is done, your ODP file will be ready for download.
The OST file's size and structure affect conversion time, though most files are processed in seconds. Advanced features allow you to convert password-protected documents and receive conversion results via email.
No matter where you are, convert your OST documents seamlessly on any device, including smartphones. Available online anytime, this conversion app is completely free for basic scenarios.
Check our videoAn OST (Outlook Offline Data File) is a file format used by Microsoft Outlook to store a synchronized copy of mailbox data locally, enabling offline access to emails, calendars, contacts, and other items. It is primarily used by Microsoft Outlook and can be accessed or converted using tools like Kernel OST to PST Converter, Stellar Converter for OST, and SysTools OST Viewer. The OST file structure is based on the Messaging Application Programming Interface (MAPI) and supports advanced features like synchronization with Exchange Server, encryption, and data compression for efficient storage and security.
The OpenDocument Flat XML Presentation (ODP) file format is an open standard for storing presentation documents, part of the OpenDocument Format (ODF) family, designed for interoperability and accessibility. It is primarily used by applications like LibreOffice Impress, Apache OpenOffice, and other office suites that support ODF, enabling cross-platform compatibility and collaborative editing. The format is based on a flat XML structure, making it human-readable and easy to process, while also supporting advanced features such as embedded multimedia, animations, and slide transitions for dynamic presentations.
You can also convert OST into many other file formats. Please see the complete list below.