Online OST Converter
Drag & drop your files here or click to upload
What is a OST file?
OST (Offline Storage Table) is a file format used by Microsoft Outlook to store mailbox data locally when using an Exchange, Office 365, or Outlook.com account. It allows users to work offline and sync changes once reconnected.
OST files include emails, contacts, calendar events, and other mailbox items. They are created automatically and typically don't require manual access, but can be converted to PST for backup or migration.
How to open OST files
OST files are used internally by Microsoft Outlook and are not designed for direct access. They are created automatically when configuring Exchange or Office 365 accounts.
To extract or view data from an OST file, use Outlook with the original account or convert it to PST using AnyConv or a specialized recovery tool.
Key facts about OST
- Full name: Offline Storage Table
- Extension: .ost
- MIME type: application/vnd.ms-outlook
- Developed by: Microsoft
- Initial release: 1997
Useful links and resources
Convert from OST
FAQ
- 👍 What is the best OST converter?
- Perhaps our OST converter is the best. AnyConv is fast, free and does not require software installation.
- 🔺 How to convert Document files to OST?
- Choose files and upload them on the page. Select "to OST" and click "Convert". After a few seconds, you can download OST files.
- 🔻 How do i change OST to another format?
- Upload your OST-file on the page. Select target format and click "Convert". OST conversion takes a few seconds.
- 📱 Can I use OST converter on iPhone or iPad?
- Yes, you can convert OST files from iPhone, iPad and other mobile devices, because AnyConv OST Converter is a multi-platform web service.