How to open .ost file format?

The probably reason why you are at this website is a problem with opening .ost file. The full name of the file is Outlook Offline Folder File. If the double-click on the file’s icon shows you a message that additional programs are needed to open the file, you’ll find the list of helpful programs in the bottom of the page.The developer of this format is Microsoft.

.ost file extension (Outlook Offline Folder File)

Category Developer/Producer File description Popularity
Misc Files Microsoft Outlook Offline Folder File
Programs using this file extension: .ost
ADS OS Software
  • Microsoft Outlook 2013
  • Microsoft OST Integrity Check Tool
  • Remo Convert OST to PST
  • SysTools OST Recovery
  • Outlook Recovery Toolbox

The file extension .ost can be used by another programs. If you have some useful information about .ost file type that may help other users, please send them to us and we’ll update our database.

Visiting our website you are probably asking yourself:
  • What application can open .ost file?
  • How to open .ost file?
  • What is .ost file?
  • How can I convert .ost file?
  • Where can I find informations about .ost file extension?
We hope we have given you enough informations about this file type. Otherwise you can search some informations about .ost extension on or