OST property Leave feedback On this page OST property See Also OST property OST or Offline Storage Files represent user’s mailbox data in offline mode on local machine upon registration with Exchange Server using Microsoft Outlook. Learn more about this file format here See Also module groupdocs.parser.options class FileType Was this page helpful? Not really Yes, thanks Any additional feedback you'd like to share with us? Skip Send Please tell us how we can improve this page. Skip Send Thank you for your feedback! We value your opinion. Your feedback will help us improve our documentation.