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Open .ost file Extension

File Type : Document file type

Compatible with: (Mac OSX 7, 8, 9, 10, 11, 12)

Searching for a program to open .ost files?
The error "There is no application set to open the document." is a common problem faced by millions of Mac users daily. This happens either because the required app to open that file does not exist or there might be some malicious apps tempering your Mac
We recommend that you run a scan on your Mac to check for potential malware threats.

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ExtensionSmallImg What is .ost file?

The OST file extension is used for the e-mail messages and other data saved by Microsoft Outlook (2005 or later) from an Exchange server. It is similar to a Personal Folder (.PST) File, but supports bigger file sizes. OST files are created when the "Use Offline Folders" option is selected in Outlook and the same is stored on the local hard drive instead of mail server.

Recommended Software Programs to open .ost file

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Microsoft Windows:
  • Microsoft OST Integrity Check Tool
  • OEMailRecovery.com Outlook Recovery Toolbox
  • Microsoft Outlook 2013
  • Remo Convert OST to PST