Free OST Viewer

Free OST File Reader to Read complete data of Outlook OST File in Windows & Mac OS.

The Free OST Reader is highly recommended and the best software to open OST file without Outlook. Free OST Viewer is an easy-to-use forensic-class read-only OST file reader tool. By utilizing this open-source OST file viewer, users can easily read orphaned OST files with attachments. Users can simply read OST file contents without any MS Outlook installation using this tiny portable utility. It is capable to read existing OST files including emails, contacts, calendars, tasks, notes, journals, etc. Also the software avaiable for both Windows and MAC OS.




Windows 11

Software Features

  • View OST file with Emails, Contacts, Tasks, Calendars, Notes, Journals, etc.
  • Preview OST file of Microsoft 365, Exchange Server, Outlook 2019, 2016, etc.
  • Efficiently Extract Searchable emails from OST files with attachments.
  • Software to Read email from OST folders like Junk Email, Inbox, Outbox.
  • Read OST file with the count of Email messages, Subject, From, To, CC.
  • OST Email Viewer facilitates users to read OST files without Outlook.
  • Freeware OST file reader is a tested tool that helps to view large OST files.
  • Read OST file in all encryptions such as No Encryption, Compressible Encryption, and High Encryption.

Best OST File Reader Specialities

OST Viewer is Portable Software to Read Large Data of Outlook OST file.

Read Unlimited OST Files One-by-One

OST File Reader File Tool is designed in such a way that it authorized the view of unlimited OST files one by one. First, start this portable OST File Viewer software and then click on the “Add File” button to browse an OST (Offline Storage Table) file from your PC.

Read Existing OST File with All Items

BitRecover OST Viewer Open-Source freeware software plays an important role during viewing existing OST files. It is capable to read OST files inclusive of complete detailed information & components like To, Cc, Bcc, From, Subject, Signature, Text, Headings, Formatting, etc.

MS Outlook Installation Is Not Compulsory

OST Reader Mac & Windows OS Software is specially introduced to view OST files without the Outlook email client. In simple words, Microsoft Exchange Server or Outlook installation is not mandatory for previewing OST files. It is a standalone software to read orphaned OST files.

OST File Viewer to Read Contacts with Details

The Free OST Viewer is also known as OST Contacts Viewer because it gives the facility to read OST file contacts. Users can freely view OST file contacts with Name, Surname, Phone Number, Business Address, Home Address, Web Address, Email ID, Contact Photo, and other details.

Read OST Emails Serial Number & Attachments

After uploading an Outlook OST file in the software panel, the tool show attachments, serial numbers, and subjects. Users can easily count emails per folder using serial numbers. If an email has an embedded attachment, then users can easily find that specific email with the (*) icon.

View and Read Outlook OST File Data







Free OST File Viewer Tool Features

Know software Features and Benefits to read Outlook OST File

Compatible with ANSI & Unicode OST Files

This OST File Viewer Tool is an authoritative software for Windows & Mac OS users that supports both old ANSI and latest Unicode characters OST files. Free OST Viewer is fully consistent with OST files of Microsoft Exchange Server or Outlook 2019, 2016, 2013, 2010, 2007, 2003, 2002, 2000, etc.

Maintains Folders Hierarchy During process

This open-source freeware software offers the “Add File” option for adding OST file data in the software panel. Thereafter, users can view all OST folders in the software window in original formatting and at last choose any specific folder for previewing OST emails.

Read Encrypted OST File Securely

OST Viewer for Mac & Win OS Tool supports all .ost file formats have No Encryption, Compressible Encryption, and High Encryption. Using this advanced feature, forensic investigators can easily analyze OST files in the software interface to get a piece of evidence.

Read Complete Outlook OST File Data

The OST File reader can easily read and view the complete data of Outlook OST files including emails, contacts, calendars, journals, notes, attachments, and other data. Also, the software has a simple and users’ friendly interface for all technical and non-technical users. So, all types of users can utilize the software with ease.

Free OST File Reader Tool Specification

Know the minimum system specifications to install the product on your Windows & Mac OS Computer.

Software Download

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Free Trial - This OST viewer is completely free software to read the data.

File Size : 2.51 MB

Version : 2.0

System Specifications

Hard Disk Space
100 MB of free hard disk space

Minimum 2 GB is Required

Intel® Pentium 1 GHz processor (2.4 GHz is recommended)

Supported Editions

  • Windows 11 (64 bit), Windows 10, 8, 7 (32 bit or 64 bit) & Windows Server 2022, 2019, 2016, 2012 R2, 2008, 2003, etc.

Outlook Editions

  • Outlook 2021, 2019, 2016, 2013, 2010, 2007, 2003, 2002, 2000, 98, and 97.

Exchange Editions

  • Exchange Server 2019, 2016, 2013, 2010, 2007, 2003, 2000, 5.5, and 5.0.

Technical Overview of the Outlook OST File Reader

One of the Best and Free software to Preview Outlook OST files. The Free OST viewer has milestone features to read the data. like users can easily read the data of all OST files exported from all versions of the Outlook email client including Outlook 2019, 2016, 2013, 2010, and other earlier versions. Also, there is no need to download the Outlook email client on your machine. The OST file viewer has a simple and users’ friendly interface for technical and non-technical users.

How to Preview OST File Data with OST File Reader Tool?

3-Step Process to Examine OST File

Upload Outlook OST File

Scan the data of OST Files

View the Complete data

Frequently Asked Questions

Find Answers to All Your Questions for viewing OST File data.

Yes, this free OST viewer is completely compatible with any version of Windows whether it is Windows 10, Windows 8.1, Windows 8, etc.

Yes, no need to worry. This tool will surely help you as it is intelligently designed by keeping your essential requirements in mind. So, download and enjoy the free OST viewer tool.

why not! Go ahead and download the OST reader for the mac tool. This is a completely free OST viewer for Mac OS X software.

Yes, this is a portable OST viewer for Mac and Windows. You can use this utility on your Mac laptop to view OST email messages in easy steps.

Yes, this OST file reader is completely free of charge. There are no hidden terms and conditions related to the OST Reader tool.

No, the OST Viewer freeware tool can be used to read OST files with all information. If you want to convert OST files then use this software to successfully migrates unlimited OST files.

OST file is an offline folder file in MS Outlook represented with an OST extension. Now users can easily work offline and the server automatically synchronizes changes with Exchange Server the next time they connect. The ability to work offline is useful in environments where the network is limited or unreliable. Thus, the creation of an OST file allows users to work in a situation of server downtime as well.

While working in an offline mode, Microsoft Outlook generates an exact copy of the user mailbox on Exchange Server named as offline folders with OST file extension. A file i.e. aforementioned file is saved locally on the desktop named an Offline folder file. The exchange contains the exact replica of the folders of an individual user. Any type of modification you perform offline will automatically be synchronized when connected to Exchange Server.

By making use of send/receive command, you can perform send or receive functions and copy the changes which were made while working offline. During this process, permanently deleted items get removed from the Exchange’s Server copy also.

Words of Clients

Clients Reviews on Our OST Viewer Tool