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Convert your OST files online—no registration needed. No matter your platform—Windows, Linux, or macOS—you can convert your OST documents rapidly. Drag and drop your file onto the upload form, pick the output format you need, and hit the convert button. After the conversion is finished, download your FODS file instantly.
Conversion time varies based on the OST file's size and complexity, but most files convert within seconds. Our advanced options include converting secured documents and delivering conversion results straight to your inbox.
Easily convert your OST documents from any location and any device, even on mobile. This conversion app is always accessible online and free for basic use.
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.
FODS is an open, XML-based file format used for storing spreadsheet data, part of the OpenDocument standard developed by OASIS. It is supported by applications like LibreOffice, Apache OpenOffice, and other office suites, offering a lightweight alternative to the zipped ODS format. The format stores spreadsheet data, formulas, and styles in a single, human-readable XML file, making it suitable for interoperability and advanced customization while maintaining simplicity.
You can also convert OST into many other file formats. Please see the complete list below.