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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 ODS 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.
The OpenDocument Spreadsheet (ODS) file format is an open standard for storing spreadsheet data, part of the OpenDocument Format (ODF) family, designed for interoperability and long-term data preservation. It is natively supported by applications like LibreOffice Calc, Apache OpenOffice, and Google Sheets, as well as being compatible with Microsoft Excel through import/export functionality. The format uses XML-based file structure, enabling features such as formulas, charts, conditional formatting, and macros, while maintaining a compact and efficient storage system for complex data.
You can also convert OST into many other file formats. Please see the complete list below.