What is .ost?
- Extension
- .ost
- Format
- Binary
- Category
- Developer
- Microsft
- Description
- n OST file is a data file created by Microsoft Outlook (2005 or later), an email client and personal information manager. It is used to store a copy of mailbox information from an Office 365, Exchange, or Outlook.com account. OST files may contain email messages, contacts, tasks, calendar data, and other account information.
- MIME Type
- application/x-ms-offline-storage
- Sample
- sample.ost