Technique to Open and View OST Attachments

admin | June 30th, 2015 | Recommendations

I am looking for a free solution to view OST attachments because I have some important OST files with attachments. Please suggest me greatest technique to open OST attachments.

OST Viewer: A Free and Independent Platform to View OST Attachments

OST Viewer is a freeware to view orphaned OST files without connecting to MS Outlook. Multiple files with their mailbox data like contacts, calendars, emails with/without attachments can be viewed in free viewer program for OST file. The OST file contents with their metadata can be previewed and advanced scan mode can repair the corrupted OST files too.

Offline Outlook Data File (.ost)

OST is the Offline Folder that gets created for Microsoft Outlook as data file when working with Exchange Server Account. This provides the facility to work Offline when not connected with server and later get synchronized with the server.


  • Can view OST files without MS Outlook.
  • Can recover corrupted files using advanced scan mode.
  • Able to view calendars, journals, tasks, attachments etc
  • Complete attributes of files such as from, to, subject etc can be previewed.
  • No pre-requisites such as Outlook or Exchange server required.
  • Familiar user interface, similar to Outlook.
  • Can switch between different views for read data.

Working with OST Viewer

OST Viewer is a Freeware and so you can download and install the software free of cost on your Windows machine. Below mentioned is a help guide that will help to open OST file and read its contents.

Click Start, go to All Programs and choose OST Viewer

  • To View the OST files, first add the file to the tool. For this click Add File.

add file

  • Click Browse button and select the required OST file from your system.
  • Check the box Advance Scan if the file seems to be corrupted.
  • Click Add File to start the scanning process of selected file.



  • Scanning process is running


  • Then select the required folder from Folder List to view the content.
  • Select the mail/ calendar/ journal and respective option to preview the data.
  • Select the tab Attachments tab to preview the attachments.
  • You can switch between the view horizontal or vertical through the Switch View option available at the top right corner.


Note: OST viewer is simple standalone software to view OST attachments. You can recover Deleted Mails using Advanced scan mode.