EdbMails EDB Recovery and Migration software
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    Exchange EDB / Email Recovery Tools
    • EDB Recovery and MigrationRecover EDB to PST, EDB to Office 365 and Exchange NO Duplicate Migration
    • OST Recovery and MigrationRecover OST to PST, OST to Office 365 and Exchange Migration
    • PST Recovery and MigrationRecover Outlook PST, PST to Office 365 and Exchange Migration
    • MBOX Export and MigrationExport MBOX to PST, MBOX to Office 365 and Exchange Migration
    • NSF Export and MigrationExport NSF to PST, NSF to Office 365 and Exchange Migration
    Exchange and Office 365 Migration
    • Exchange Server MigrationMigrate Exchange 2007, 2010, 2013, 2016, 2019 to Office 365 tenants. Also, migrate between Exchange servers and PST
    • Office 365 MigrationMigrate Source Office 365 tenants to Destination Office 365 tenants. Also, migrate to Exchange Server and PST
    • IMAP Email Backup & MigrationMigrate all IMAP email servers (Gmail, Zimbra, Zoho, Yahoo etc.), Office 365, Exchange and Backup to Outlook PST
    • SharePoint Online MigrationMigrate documents, files and folders from SharePoint sites
    • OneDrive for Business MigrationMigrate documents, files and folders from OneDrive
    • Microsoft Teams MigrationMigrate Teams, documents, files and folders etc.
    Exchange and Office 365 Backup
    • Office 365 BackupIncremental, Granular, Encrypted and Compressed Office 365 Mailboxes Backup
    • Exchange Server BackupIncremental, Granular, Encrypted and Compressed Exchange Mailboxes Backup
    • SharePoint, OneDrive & Teams BackupBackup Online site collections, Team sites, Office 365 groups, all documents etc.
    • Duplicate Remover - Office 365 & Exchange Remove duplicate emails, calendars, contacts, journal etc. from Office 365 and Exchange
    • GAL and All Address Lists migrationDirectly migrate Exchange and Office 365 Global address list and Address Lists items
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    3. Free OST file viewer to preview the complete OST data

    EdbMails OST viewer

    Free OST file viewer to open and view OST data

User Manual

  • Overview
  • System Requirements
  • Installation
    • Installation process
    • Reinstall or Upgrade
    • How to uninstall
  • Initial Setup
  • FAQ
    • OST to PST
    • OST to Office 365 Migration
    • OST to Exchange Migration
  • Videos
    • OST to PST Converter
    • OST to Office 365 Migration
    • OST to Exchange Migration
  • Screenshots
    • OST to PST
    • OST to Office 365 Migration
    • OST to Exchange Migration
  • How it works?
    • OST to PST Converter
    • OST to Office 365 Migration
    • OST to Exchange Migration
  • Connect to Exchange server for multiple mailboxes migration
    • Connect with Global Admin
    • Connect to multiple users using CSV file
    • Connect using full access permission
    • Connect individual users for Single / Specific user Migration
  • Connect to Hosted Exchange for its Migration
    • Connect with Full Access permissions
    • Using multiple user credentials with CSV file
    • Connecting to Individual user for its migration
  • Connect to Office 365
    • Modern Authentication Using OAuth 2.0
      • Microsoft 365 modern authentication
      • Automatic Registration
      • Manual Registration
    • Connect with Global Admin
    • Connect to Office 365 with full access permission
    • Connect to Office 365 with CSV file option
    • Connect to Office 365 as single user mailbox
  • Set Exchange Server Impersonation rights
    • Exchange 2007 and below
    • Exchange 2010, 2013, 2016 and 2019
    • Set using Exchange Server GUI
  • Knowledge Base
    • Corrupt OST file recovery
    • Unicode and ANSI OST format
    • Split OST file
    • Rebuild OST file
    • Exchange mailbox backup
    • Recover orphaned OST file
    • Recover all Exchange and Outlook OST files
    • Recover metadata and attachments
    • Export unlimited OST files to PST
    • Free OST file viewer
    • Granular recovery of OST file
    • Recover encrypted OST file
    • Recover deleted mailboxes from OST
    • Export email, calendars, contacts
    • Selective OST export
    • Migrate OST to Office 365
    • OST to Live Exchange
    • Outlook OST cannot be accessed
    • Log report
    • Fix Outlook not connecting to server error
    • Fix Outlook the set of folders cannot be opened
    • Fix Outlook not syncing error
    • Outlook Cached Exchange mode
    • Fix Outlook data file cannot be accessed
    • Fix the error Outlook inbox not updating
    • Your mailbox has been temporarily moved on Exchange server
    • Open OST file in Outlook
    • Repair corrupted OST files from Outlook 365
    • Save Outlook emails to hard drive
    • Import OST file into Outlook
    • Your Outlook data file cannot be configured
    • Errors have been detected in the OST
  • Incremental Migration
  • Exchange Throttling Policy
  • Set Office 365 Impersonation rights
    • Using PowerShell commands
    • Using Office 365 GUI
  • Map the Mailboxes
  • Multifactor Authentication
    • Enable MFA in Office 365
    • Create App password for MFA
    • Disable Security Defaults

What is an OST file?

An Outlook OST file, or Offline Outlook Data File, is a file that allows Microsoft Outlook to work in offline mode, without a connection to the server. It is normally created when you use Cached Exchange mode in Outlook.

When Outlook is configured to use an Exchange Server account, it creates a local copy of your mailbox data on your computer in the form of an OST file. This file contains a synchronized copy of your mailbox items, such as emails, contacts, calendar items, tasks, and notes.

The OST file enables you to access your mailbox data when you are offline, and any changes you make to the data are saved locally and automatically synchronized with the server the next time you connect to the network.

OST files are especially useful for users who work in areas with intermittent or no internet connectivity, or for those who want to work offline without losing access to their mailbox data. It is important to note that Outlook cannot open an OST file in Windows directly. You need a professional OST opener tool or convert the OST to PST to retrieve your mailbox items.

QUICK LINKS

Difference between OST and PSTImport OST to Office 365Export unlimited OST files to PSTRecover encrypted OST fileGranular recovery of OST fileOutlook errors have been detectedRecover metadata and attachments from OST

Free OST file opener and viewer tool

EdbMails free OST File Viewer enables you to open and easily read the contents of OST files. It can also open corrupted and orphaned OST files and is compatible with all Windows and Outlook versions.

  • The application displays the folder / email data of OST files without connecting to the Exchange server.
  • The OST file reader displays the contents of password protected OST files.
  • Open large size OST files with ease and preview all the email messages, folders, contacts, calendar items, notes, appointments and journals.
  • You can view the Offline OST files with all of the associated email data.
  • You can also view the information such as the Sent and Received date of the message, From Address, To Address, Subject, Mail body, Attachments and other email header information.
  • Quickly open and read an OST file when the Outlook emails are not syncing with the server.

Outlook OST viewer

Steps to view an OST file and its contents

  • Install and start EdbMails OST to PST Converter.
  • Select OST file from which you want to view the emails
  • Load and open the OST file mailbox data in the tree view.
  • Click on the emails, calendar and contacts to preview the data.

Uses of EdbMails Outlook OST viewer

  1. Retrieve important information: If the Outlook file cannot be accessed, or if the Outlook account is not accessible, the OST file can still contain important information that needs to be retrieved. With EdbMails free OST reader, you can view the OST file contents and retrieve any critical information you need.
  2. Confirm data integrity: If you suspect that the OST file has been corrupted or has been compromised, you can use the EdbMails Free OST File Viewer to confirm the integrity of the data in the file.
  3. Repair and view OST files: EdbMails can repair and recover corrupted and orphaned OST files without requiring the original Exchange server profile that you configured your account with. You can also convert the OST to PST and also import the OST file into Office 365 and Exchange.

Features of EdbMails free OST viewer tool

  1. View OST file contents: With EdbMails Outlook OST Viewer, you can view all the contents of the OST file, including emails, contacts, calendar items, tasks, and notes.
  2. Save OST file in different formats: With EdbMails, you can also save your emails from the OST file in HTML, EML and MHT formats for different requirements. Learn how to copy outlook emails to an external hard drive.
  3. No need for Microsoft Outlook: EdbMails Outlook OST Viewer eliminates the need for Microsoft Outlook, making it possible for you to view the OST file contents on any computer without installing Outlook.
  4. Easy to use: The tool has a user-friendly interface that makes it easy for you to navigate and preview the OST file contents without requiring technical knowledge. With EdbMails, you can also directly migrate OST to Office 365 and Live Exchange.
  5. Lightweight: The tool is lightweight and does not require a lot of resources, making it an excellent choice for users who want to open or view an OST file with limited storage on their computer.
  6. Full software compatibility: EdbMails is compatible with Outlook 2021, 2019, 2016, 2013, 2010, 2007, and 2003, as well as Windows 11, 10, 8.1, 8, and 7.

Frequently Asked Questions (FAQ)

  1. How to open OST files without Outlook?

    You can use EdbMails OST viewer to open OST files without Outlook. Here are the steps to open OST files with EdbMails.

    • Step 1: Install EdbMails Free OST File Viewer
    • Step 2: Browse and select the OST file you want to view
    • Step 2: Open the OST file and preview the contents such as emails, calendars and contacts. That’s it!
  2. What is an orphan OST file and how do I open one?

    An orphan OST file is an Outlook Offline Storage Table (OST) file that has lost its connection to the original mailbox or Exchange Server. This can occur if the mailbox has been deleted or if the Exchange server is permanently decommissioned. When an OST file becomes orphaned, it can no longer synchronize with the mailbox, and any new data or changes made to the mailbox will not be reflected in the OST file.

    To open and convert orphan OST files, you can use a specialized tool like EdbMails Free OST File Viewer.

  3. Where is the OST file located on my computer?

    The location of the OST file on your computer depends on the version of Outlook and the operating system you are using.

    Here are the default locations of the OST file on different versions of Windows and Outlook.

    Windows 10/8/7/Vista:

    For Outlook 2019/2016/2013/2010:

    C:\Users\AppData\Local\Microsoft\Outlook

    For Outlook 2007:

    C:\Users\Local Settings\Application Data\Microsoft\Outlook

    Windows XP:

    For Outlook 2019/2016/2013/2010/2007:

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

    Note: represents your Windows user account name.

    If you have customized the location of your OST file or if you are using a different version of Outlook or operating system, the location of the OST file may be different.

    To locate the OST file on your computer, follow these steps:

    • Step 1: Open Outlook on your computer.
    • Step 2: Click on the ‘File’ menu and select ‘Account Settings’.
    • Step 3: In the ‘Account Settings’ dialog box, select the ‘Data Files’ tab.
    • Step 4: In the list of data files, look for the OST file you want to locate and click ‘Open File Location’.

    The Windows File Explorer will open to the location of the OST file.

  4. How to open corrupted and damaged Outlook OST files?

    Opening a corrupted or damaged Outlook OST file can be a challenging task as it may not be possible to access the file using Microsoft Outlook. However, you can use EdbMails, which can rebuild and repair the OST file. It is specifically designed to recover corrupted and damaged files and convert the OST file to PST.

    • Step 1: Download EdbMails OST to PST converter
    • Step 2: Launch the software and click ‘Browse’
    • Step 3: Select the OST file you want to convert.
    • Step 4: Preview and select the mailbox items for export
    • Step 5: Click ‘Export OST to PST’ to start the conversion
    • Step 6: Import the PST file into Outlook to view all your mail items
  5. What are the system requirements for EdbMails OST viewer?

    EdbMails OST viewer is a lightweight software that can be installed on most Windows-based systems. Here are the system requirements for EdbMails OST viewer:

    • Operating System: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista, Windows XP (SP3)
    • Processor: 1 GHz processor (2.4 GHz recommended)
    • RAM: 512 MB (1 GB recommended)
    • Hard Disk Space: 50 MB of free space
    • Microsoft .NET Framework: Version 4.0 or higher
    • Operating System version: Supports both 32-bit and 64-bit OS
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