Kernel OST Viewer - It’s Free

This tool generates free preview of all OST file items including emails, calendar, deleted items, attachments, contacts etc. OST reader tool supports viewing healthy & corrupt OST files. Along with it, the software allows opening email and attachments.

Opens OST file(s) without Exchange account/MS Outlook
Displays all OST items including emails, attachments, Deleted Items, Calendar, Contacts, etc.
Works with healthy & corrupted OST files
Allows to Copy & Print the OST email list in HTML Format
Find Specific OST email items
Creates a comprehensive file analysis report to analyze OST data
Owns user-friendly graphical user interface
Compatible with all Exchange and Outlook versions
Opens OST email attachments
Completely FREE software for all users

Kernel OST Viewer Free Software Features

Access OST Files Without Exchange Server

OST Viewer tool allows access to Exchange Offline folders file (OST) without establishing a connection with MS Exchange Server. The tool scans OST file and displays its entire content including emails, calendar items, notes, contacts, etc.

Find and Open Emails

With OST Viewer tool, you have the privilege to access particular email items with ‘Find’ option. In the selected mailbox folders, you filter the emails by From, To, Subject, Date Range, Attachments, etc. Thus you can locate and preview specific emails.

Saves Email List in HTML

The OST Viewer tool allows you save the list of OST emails in HTML format. You can copy or print this list. The tool also provides access to email attachments in a single click.

Opens All Kinds of OST Files

OST Reader tool is capable of opening healthy as well as corrupt OST files. The tool is capable of opening OST files without an Exchange profile.

Search OST Files Within Disk Drives

The tool makes the task of finding OST file easier with the Search option. This option locates the OST file within disk drives. You just need to enter the drive in which you know your OST file is located. The tool will automatically fetch the OST file located in the mentioned drive and you can open it by clicking on it.

Open Multiple OST Files

You can open as many OST files as required. There is no restriction in number of OST files to view. You can add multiple OST files with the + button in Source File Selection dialogue box. This feature saves the users’ time from adding individual OST files one-by-one.

Generates File Analysis Report

Free OST Viewer tool creates reports having details of all item types such as emails, contacts, email flow density as per sender or data, notes etc. It helps you analyze the OST file data.

High Software Compatibility

Kernel OST Viewer Free tool extends support for all versions of MS Exchange Server (2016, 2013, 2010, 2007, 2003, 2000, 5.5, and 5.0), MS Outlook (2016, 2013, 2010, 2007, 2003, 2002, 2000, 98, and 97) and Windows OS (10, 8.1, 8, 7, Vista, XP, 2000, 98, NT, and 95).

FAQs - Kernel OST Viewer

I have Office 365 account configured in Outlook. Is my all data copied in local OST file?

You can configure an Office 365 account in Outlook using IMAP configuration. Then as the rest data is saved as a copy of mailboxes in OST file, the configured Office 365 data is also copied in local OST file.
When does an OST file becomes an orphan OST file?

OST file, as we know is an offline copy of the mailbox available on the Exchange. To access OST file with latest information, its synchronization with Exchange is needed. When the mailbox is unavailable on Exchange Server permanently, then the OST file is termed as orphaned OST file.
Does the OST Viewer tool allow Opening attachments from the mails?
Yes. You can view the attachments in the OST emails. Here are the steps:
- Step1: Select the folder from left pane
- Step2: From the right pane, select the email of which attachment you want to open
- Step3: In the email preview double click on the attachment.
Please help me to find my OST file.

Thanks for contacting Kernel Data Recovery, we are happy to help you. You can use Search option in OST Viewer tool to find your OST file easily by providing only drive location.
I want more information about the File Analysis Reports feature of the tool. Please explain.
Using the File Analysis Reports feature, you can have an overall information about the content of OST file. Let us have a look at the reports available.
- Total item types: Generates a graph between Total item types and item count.
- Mail flow density by date: Generates a graph between Item count and date.
- Mail flow density by senders: Generates graph between Item count and senders.
- Interaction between users: Generates graph between Item count against Sender & Receiver pair.

OST Viewer Tool – What’s it for?

Opening OST mailbox items without Exchange profile/connection
Viewing orphaned, corrupted and healthy OST files without Outlook
Viewing email data by Date, From, To, etc.
Viewing attachments of OST file emails
Saving OST email list in HTML format
Viewing analytical reports on OST file content

By reading the above points about the tool, 2 questions may arise in our mind

What is an OST file?

OST file stands for Offline Storage Table which is an offline copy of the Exchange mailbox. You can make changes in OST file content in offline mode. The changes made in OST file will get automatically updated by synchronization when connected with Exchange Server.

Where is the OST file located?

OST file can be found without opening Outlook/Exchange by 2 ways

1.Searching at default location

You will find the OST file at this default location - drive:\Users\user\AppData\Local\Microsoft\Outlook

drive:\Documents and Settings\\Local Settings\Application Data\Microsoft\Outlook

2.With Search option in OST Viewer tool

In OST Viewer tool, Search option automatically extracts all the stored OST files from the specified drive at one go.

To perform this, enter the drive location and click Search in Source File Selection dialogue box. All the OST files are extracted at once, thus making the task of locating OST file convenient for users.

Open OST files without Exchange or Outlook with these steps

The Free OST Viewer has an interactive GUI that helps in viewing OST files much easier.

Launch the free OST Viewer application. In the Source File Selection dialog box, browse the OST file that you want to open.
Then, select the OST file and click the OK button.
Note: You can use the Search option to get the location of OST files in a specific drive.
Once scanning procedure is completed, mailbox folders are displayed in the left panel in a tree-like structure.
User can navigate through the folders listed in the left panel to view the content of the desired folders Inbox, Contacts, Calendar Items, Sent Items, and so on.
To save the OST email list, click Save list information to HTML file button.
To generate OST File Analysis Reports, click the required report type on the right pane. Then select the required folders and click Analyse.
The OST file Analysis Report will be generated instantly.

User Reviews & Ratings (142)

Topic: OST Viewer

4.6/5 (141)

Ottocar

The utility is designed with a fabulous GUI. It requires no external help or assistance to operate the software.

28.02.2018

Sinclair

In the absence of Outlook platform, if you want to access any OST email or its attachment, then use the OST viewer. It is completely free and can open an unlimited number of OST mailboxes easily.

23.02.2018

Searle

The OST viewer tool is the finest tool which I used to see the content of a corrupt OST file. It was not opening in the Outlook, and I needed to access some important emails from my clients. Thanks to the tool I got the email data quickly.