Top 3 Free OST Viewer Tool to View Offline OST Files

If your OST file has been corrupted or the connection to the Exchange server is broken, you will be unable to view OST file database. Even you cannot directly import and access this orphaned OST file in any other Outlook profile.

Sometimes when a user’s Outlook OST file gets corrupted for uncertain reasons and users totally surprised and took tensioned for their crucial email databases. OST file Viewer helps users to read and view offline OST files again without Outlook & Exchange Server installation. In this post, I will assist you, how you view your OST file databases using top-rated 3 tools.

Reason Behind OST File Corruption:-

There are multiple reasons by which user faces OST file damage related issues. Some of the common reasons are:-

  • Due to a sudden hardware problem
  • When the storage capacity is exceeded
  • In the presence of bad sectors in the hard drive
  • Due to sudden short circuit in electricity
  • Barriers to using unknown software
  • The storage limit has been reached
  • Outlook Add-in is not compatible with the current version
  • Outlook is not working properly

Top 3 Free OST File Reader Software To View OST File:-

MailsSoftware Free OST Viewer

This OST Viewer Tool is a much-appreciated tool provided by MailsSoftware, one of the most reliable data care brands in the world. The application is helpful to read all inaccessible OST files Without Microsoft Outlook. It displays complete OST file databases with full accuracies, like- E-mails, Calendars, Notes, Contacts, Journals, Tasks, etc. Here users can quickly filter and find specific Outlook OST file email stuff.


  • Very easy to download, install and run for all tech and non-tech users
  • Compatible to scan & fix OST file junks before presenting in the preview panel.
  • Superstitious freeware solution to access and read offline OST file with 100% accuracy.
  • Facilitates users to import and view multiple OST files at a single time without any alteration.
  • Shows all Exchange Server OST file with maintaining folder hierarchy & text formatting.
  • It can be easily installed on Win 10, 7, 8, XP, Vista and other Windows OS supported systems.


  • This software is also not available for Mac versions.
  • The installation process of this solution is a little bit slower than MailsDaddy Tool.

MailsSoftware OST Viewer Pro: This program also comes with pro version features that enable users to convert OST files into PST, EML, MSG, MBOX, HTML, and MHTML formats. Here uses can split heavy offline OST files into small Outlook PST files. The software easily converts all contacts in .vcf and calendars data in .ics format. It offers users to export some select offline OST files/emails/folders into Microsoft PST format.

MailsDaddy Free OST Viewer

If you want to go for a trustworthy solution download MailsDaddy Free OST Viewer that enables users to read all offline OST files without investing money. Most of the professional developers and Outlook clients are suggested to users this free ost file opener tool.  Lacks of users read their OST files Worldwide with 100% user satisfaction. The application provides a scan facility that quickly recovers corrupted and inaccessible OST files before presenting them in the preview panel.


  • Allows accessing all complete OST file databases without any alteration.
  • A newbies user can also easily work on it and view OST file email & other items.
  • Helps to add multiple OST files, scan, and show the preview of inaccessible & orphaned OST files.
  • No requirement of MS Outlook or Exchange Server to open OST files.
  • Retains all internal folder structure, meta properties, and text formatting.
  • Offers to filter, find and read some specific OST file emails.


  • Now available for MAC users.

MailsDaddy OST Viewer Pro: MailsDaddy provides the Pro version of this OST viewer solution to convert OST files into EML, MSG, MHTML, contacts in CSV, and calendar details in ICS format. Using this users can also convert required OST file databases without any changes in original content.

A2Z Migration for OST to PST

To get the responsive result in OST file viewing download A2Z Migration for OST to PST Tool. This outstanding solution offers a free preview panel to read all offline OST files without purchasing. It is also compatible to recover corrupted OST files and demonstrate complete email items preview without spending money. Here users can easily filter, find and view some required OST file messages without any hard effort. After purchasing this users get more options, like- file conversion, selective data conversion, split PST, and other advanced features.


  • Offers an easy work environment to quickly access it, even by a newbie user.
  • Helps to easily retrieve all damaged & inaccessible offline OST files.
  • Use free preview panel to open & view Exchange Server, Hotmail, and IMAP OST files.
  • Converts OST file into PST, EML, MSG, EMLX, HTML and RTF formats.
  • Helps to save Contacts and Calendars to .vcf and .ics formats separately.
  • Allows fragmenting heavy OST file into small Outlook PST files.
  •  Filter & convert selected OST files into PST & other given formats.


  • The utility is only available for Windows users.
  • Needs to add other advanced features.

Free Demo Pack:- Users can use the free demo pack of this solutuon to read OST files at free of cost. Another more, It also enables users to convert the first 20 email items per mailbox from OST to PST, EML, MSG, and other formats without any cost.

Closing Statements

These are some unique OST File Viewer Tool that helps to read OST file databases without any hard effort. You can use any one of them to access and view OST file emails. I believe all tools will much helpful to fulfill all your requirements.

Read More: How to Convert Microsoft .OST to .PST File in Outlook 2019

Read More:-Need of OST to MBOX Conversion and How to perform?

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