OST Viewer Mac: Freeware Software to Read Outlook OST Files

It is good news for Mac OS users because now they can easily read OST file through OST Viewer Mac software that is fully loaded with multiple advanced features like Mac users can easily open corrupted OST files without having trouble. Nowadays, MS Outlook is most commonly used by technical users. While using Microsoft Outlook, email messages, calendar, tasks and other items are saved on your system. These saved items of Outlook are stored in Outlook Data File as .pst and .ost format. Outlook Data Files i.e. .pst is used for POP3, IMAP and web based mail accounts.  Whereas .ost files are used when you have exchange account and want to work offline or use the default cached exchange mode.


Folders which are found in your mailbox are generally the replicas of offline folder on the system where Microsoft Exchange is running. This makes it possible to work with the content of folder located on server when not connected to the network and when again connected, update the folder and its corresponding server folder to make the contents of both identical folders. This procedure is known as synchronizing folders. You can easily add, delete and change the contents of offline folder exactly as same as folder located on a server.

What is OST file?

MS Outlook created OST format which is a short form of Offline Storage Table files. As soon as server is connected, OST files store the offline work. Later, MS Outlook turns online and all the emails and information which are saved is respectively delivered to the client immediately. In certain circumstances, when there is a limited network or unreliable then in that situation OST proves to be a great and excellent process.

Some advantages of OST file 

  1. OST files have great importance while working offline. Many users across globe make use of this method for safe and secure work. Because of OST, there will be no loss of work, and no matter whether the exchange server is connected or not.
  2. It is flexible as you can easily work offline without exchange server
  3. Serve as a backup in case of unintentional deletion of data. User can easily recover emails anytime and save them in PST format.

Reason of Corruption

OST file store mailbox information of MS Outlook when not connected to the Exchange Server. Many situations immediately occur when you are unable to access the information of Outlook mailbox. It could be due to the corruption of OST file. Below are some issues of OST file corruption…

  • Exchange server crash
  • Attack of Malicious Virus
  • Exchange server downtime
  • Large size of OST file
  • Corruption of database
  • Unintentionally deletion of user account

This is the major reason of why OST file became inaccessible. Due to this you have to go through severe data suffering condition.

How to view corrupted OST file?

Use OST Viewer Mac tool to view corrupted OST file. OST Viewer for Mac utility is an intelligent solution designed by top expertise. It is easy and very simple to use. Both technical and Non-technical users can easily make use of OS X OST Viewer. User can simple view unlimited corrupted OST file with attachments. No MS Outlook installation required.

OST Reader Mac is designed in a way that it fully supports ANSI and UNICODE file format of Outlook data files. It is most commonly used by forensic investigators to investigate the evidence related to OST file. A read-only scan is performed by utilizing OST File Viewer Mac. This portable utility is technically designed which allows users to open and view .ost files. It maintains the message formatting during message preview. OST File Viewer Mac is capable to view files ranging from 2 GB to 30 GB. It is basically designed for Mac but Windows users can also make use of this portable utility.


  1. Riki Rachtman December 17, 2015
  2. Ravi Gupta August 18, 2016

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