OST or Offline Storage Files represent user's mailbox data in offline mode on local machine upon registration with Exchange Server using Microsoft Outlook. It is automatically created on the first use of Microsoft Outlook upon connectivity with server. Once the file is created, the data is synchronized with the email server so that it is available offline as well in case of disconnectivity from email server.
Upload your OST document and you will be redirected to the OST Viewer with great user experience and many more features.
It works from all platforms including Windows, Mac, Android and iOS. All OST files are processed on our servers. No plugin or software installation required for you.
Powered by GroupDocs.Viewer. All OST files are processed using GroupDocs APIs. The GroupDocs.Viewer supports 90+ file and document formats.
You can also view many other file formats. Please see the complete list below.