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.
We recommend that you
run a free scan to check for missing drivers.
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 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: