SysTools OST Viewer Freeware

View Multiple Orphan OST Files With Attachments On OST Viewer Tool

  • Standalone Tool to View Offline OST File with Attachments
  • Preview Emails, Contacts, Calendars, Tasks, Notes, Journals
  • Add Multiple OST Files One by One & Open Item in an In-built Viewer
  • Advance Scan Mode to Recover Deleted OST File Items
  • Provides Item count for each Folders and Sub folders of selected OST file
  • Bulk OST Reader: Software preview bulk of OST files at a time.
  • Server Environment Not Required to Open and Read OST Files
  • Has option to move temp folder path to other drive to address space & loading time issues.
  • Reload the saved scan file and view without taking time.

List of Key Features in SysTools OST Viewer Freeware Tool

preview ost file

Preview Multiple OST Files

With free OST Viewer, you can read multiple OST file; emails and other items. The software will generate a Preview of all messages with attributes like; From, Subject, To, Sent, Received date and Size in bytes.


open and view attachments

View Email Attachments

OST Viewer will display the attachments preview of each email within the in-built viewer. It is possible to view & open OST file attachment types like: image, documents, files, etc and other similar files.

scan modes

Dual OST File Scan Modes

OST File Viewer allow you to select the scanning mode as Advanced once you select open OST file. If file is healthy or has minimal corruption; Quick scan run by default, otherwise choose Advance Scan mode.


no installation needed

No Pre-requirements

To use OST viewer freeware; you do not need to have any specific application like: Outlook or Exchange Server installed on your system. It is a standalone utility to read and open multiple OST files.


View OST Contacts

OST Contact Viewer

Software interface show the preview of OST Contacts & Distribution list. As you launch the tool, the entire contacts will appear in a similar way as it appears in MS Outlook.


view OST Calendar

OST Calendar Viewer

By default the screen of OST Viewer show the email, but you can navigate to the calendar tab to open Calendars of OST file. Apart from that the software also read Notes, Tasks & Journals.


View OST in Optimized Way

Optimized OST Viewing

The OST File reader allow you to Open OST file items in optimized way without showing any crash report. As it provide option to change the location of Temp folder (of software) from installation drive (C drive) to any free drive space, which in turn reduce the main memory consumption.


OST Viewer Screenshots

ost viewer tool
>Step 1: Launch OST Viewer Software
scan modes
Step 2: Choose Between Quick & Advanced Scan Modes
view ost messages
Step 3: View OST Email Message
switch views
Step 4: Switch View Horizontally or Vertically

Watch Live Video of OST Viewer Pro

Download OST File Viewer Freeware
OST viewer

Size:14.1 MB Version: 4.2

Download Freeware

Installation Uninstallation EULA

Upgrade to OST Viewer Pro for Advance Search Option and Export as PDF

System Specifications

  • Hard Disk Space: 10 MB of free hard disk space

Supported Editions

  • Microsoft Windows – 2000, 2003, 2008, XP, Vista, or Windows 7/8/8.1/10, 2008/2012 (32-bit & 64-bit)
  • MS Outlook – Outlook 2000, 2003, 2007, 2010(32/64 bit), 2013 (32/64 bit), 2016 (32-bit)
Frequently Asked Question
Can I use the Software on Windows 10 Machine and read OST file easily??

Yes, the OST Viewer tool is compatible with Windows 10 machine and all its previous versions. Of-course you can Read OST file easily by the help of Ost file Opener.

Is there any limitation on the size of OST file that the software can process?

No, there is no limitation on size of OST file or number of emails that the OST file explorer software can process and Open.

Is the software free to use or do I have to pay for it later?

OST Viewer is an application absolutely free of cost with limited options. For advance options like: Export to PDF or Advance Search; you need to upgrade to OST Viewer Pro.

Can I Open an Orphan OST File with Free OST Viewer?

Yes, you can view an orphan OST file using OST Viewer. No application or Server environment is required to open and view OST files by OST file browser.

Can I Open and Read a Corrupt OST File with OST Viewer?

Yes, the OST explorer software will allow you to view OST file contents which is corrupted no matter what type of corruption it is, you can view OST file easily. OST file opener tool has two modes of scanning: : Quick and Advance. Quick mode is used by default & if there is minor corruption and still if you are not getting whole data items of OST file then use Advance option for scanning. This mode scans every sector of the file deeply and is used for high corruption.

Will software work even without Outlook and Exchange Server Environment?

Yes, Free OST file Reader will View OST file in Outlook and even without Outlook, and Exchange Server environment. OST browser software completely independent of Outlook or Exchange Server to Open and View OST file. & convert OST file.

What Clients Say

We are a forensic research firm and usually analyze the orphan OST files but due to various limitations it becomes a typical job. OST viewer pro has made the task easier for us to open and read OST files items as well as export it as PDF to keep emails confidential.

— Paul Gregor, Australia

Due to exchange server downtime, I suffered a lot as my OST file become inaccessible. Thanks to free OST viewer; which helped me to open and read all items within my .ost file even when exchange server is not live or is unavailable.

— Siobhan Paolo, Greece

Upgrade to SysTools OST Viewer Pro – Why?

preview email

Preview Email in Various Styles

Open OST file to read single email message in multiple view modes like: Normal, Hex View, Property View, Message header view, MIME View, RTF View and attachments.


auto load emails

Sort Emails Via Property

Once the emails in OST file get listed, you can sort it by arranging its properties like: From, To, Received date, Sent Date, and Size in KB in upside down or vice versa order. The OST Opener Pro will help you to quickly read messages.


advance search

Advance Search OST File

OST Viewer Pro grants the advance searching feature to find specific email by typing a matching keyword or term. You can apply various filters to perform deep searching of messages of an OST file. read more


ost to pdf converter

Export OST to PDF

Create PDF file for each OST file email using export option. It is possible to batch export OST file emails to PDF format along with attachments or use checkboxes for selective item export.


naming option

Date Based Email Filter

When saving emails, you can also apply a date range of your choice to filter out emails of the selective range and export them. The OST file browser pro will help you to export OST files items within a date range.


save selective files

Save Selective Files or Folders

You can check or uncheck the files or folder which you want to export from OST to PDF. So, either you can apply filters or can check / uncheck checkboxes provided for each file / folder to perform selective files.


naming option

Set Naming Pattern for PDF

Use different combinations of date, year and month (DD-MM-YYY) as well as auto incremental or MD5 options to save each converted data being saved into PDF file. By default, the files will get saved as subject; if you want you can change it. read more


new folder

Make New Folder to Save File

OST Viewer prompts you to choose a desired location for saving converted OST file. If you want, you can also create a new folder from the software panel to save the PDF files directly into it.


Upgrade to OST Opener PRO Edition

Upgrade to OST Viewer Pro for Advance Search Option and Export as PDF


Features FREE Version FULL Version
Add OST File
Auto Scan Mode
Preview OST Files
View Emails with Attachments
Windows 10 & All Other Previous Windows Version Supported
Advance Search Options
Naming Option
Save & Export to PDF Document
Cost FREEWARE $69