How to open a file with .ost extension?

File Type : Document file type
Compatible with (Win10, Win8, Win7, Vista and WinXP)

You'll need a new app to open this .ost file

Searching for the right program to open .ost files?

"You'll need a new app to open this file" is probably the most common error faced by millions of Windows users every day. This is either because the program required to open a file is not available on your system or there may be other issues.


What is .ost file extension?

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.
You can see a list of software programs here on www.easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.

Software that can be used to open ostfiles:

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