EdbMails EDB Recovery and Migration software
  • Products
    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
    • EML to PST ExportEML files export to Outlook PST format
    • PST to MSG ExportOutlook PST files export to MSG format
    • MSG to PST ExportExport MSG files Outlook PST files
    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
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User’s Manual
OST Recovery and Migration

User Manual

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 target Office 365
  • Modern Authentication Using OAuth 2.0
    • Microsoft 365 modern authentication
    • Automatic Registration
    • Manual Registration
  • 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
  • Map the Mailboxes
  • Multifactor Authentication
    • Enable MFA in Office 365
    • Create App password for MFA
    • Disable Security Defaults
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  3. Free OST viewer tool - Open Outlook OST file in Windows
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Free OST file viewer to preview the complete OST data

An OST (Offline Storage Table) file stores a synchronized copy of your Outlook mailbox, allowing you to access emails, contacts, calendars, and other items even when disconnected from the internet. While this setup works seamlessly with Exchange and Office 365, accessing the data becomes difficult if the OST file is orphaned, corrupted, or tied to an unavailable Outlook profile. In such cases, Outlook alone cannot open or recover the contents.

To address this limitation, EdbMails Free OST Viewer Tool offers a reliable way to open and examine OST files without needing Outlook or a live mail server connection. Whether the file originates from Exchange Server, Office 365, or an IMAP account, EdbMails enables you to preview all mailbox data, including emails, attachments, contacts, calendars, and tasks—regardless of the file’s condition.

Export unlimited OST files to PST

The tool features a straightforward step-by-step interface, guiding you through file selection, scanning, and previewing. It’s a practical solution for viewing inaccessible OST files directly on Windows systems, ensuring uninterrupted access to important mailbox data.

EdbMails Free OST viewer to easily open and view OST file data

EdbMails free OST file viewer lets you open and easily view 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 an Exchange server profile.
  • 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.
  • Steps to open OST files with EdbMails OST viewer tool

    Step 1: Download and install EdbMails OST to PST converter tool

    • Download and install the EdbMails application on any Windows-based computer.

      EdbMails software installation

    • Enter your email address and password to log in or click on ‘Start Your Free Trial’ to explore the features without registering.

      Login to EdbMails application

    • Select ‘OST Recovery and Migration’ from the product list.

      Select OST Recovery and Migration

    • Select operation as ‘OST to PST’.

      Select OST to PST

    • Keep the default job name or enter a custom name for easier tracking, then click 'Next' to continue.

      Enter export job name

    Step 2: Select the OST file you want to open to view its emails

    • Click ‘Browse for OST file'.

      Browse for EDB file

    • Browse and select the OST file from your computer that you want to view, then click 'Next' to proceed. If the file is stored on a network, ensure it’s shared with read and write permissions.

      Select OST file

    • Click ‘Browse’.

      Click Browse

    • Choose the folder where you want to save the exported PST files, and make sure the drive has sufficient free space for the export process.

      Select PST location

    • EdbMails scans your OST file and recovers data in case of corruption.

      Recovery operation progress

    • After the recovery is complete, the full folder structure will be displayed in the left pane. Expand the mailbox to browse folders and preview their contents. With EdbMails’ built-in viewer, you can directly open & view emails, contacts, notes, tasks, and calendar items without an Outlook.

Benefits of EdbMails Outlook OST viewer

  1. Retrieve important information: If the Outlook file or account is inaccessible, the OST file may still hold important data. With EdbMails’ Free OST Reader, you can access the contents and retrieve any critical information without needing Outlook.
  2. Confirm data integrity: If you suspect that the OST file is corrupted or compromised, EdbMails Free OST File Viewer can help you check its contents and verify data integrity.
  3. Repair and view OST files: EdbMails can repair and recover corrupted or orphaned OST files without needing the original Exchange server profile. It also allows you to convert OST files to PST and import them directly into Office 365 or Exchange.

Advanced capabilities 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. Open OST file without Microsoft Outlook: EdbMails Outlook OST Viewer lets you access OST file contents on any computer without needing to install Microsoft Outlook.
  4. Easy to use: The Software comes with a user-friendly interface that makes it easy for you to navigate and preview the OST file contents without requiring technical knowledge.
  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, and 2007, as well as Windows 11, 10, 8.1, 8, and 7.

Frequently Asked Questions

  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've changed the default OST file location or are using a different version of Outlook or Windows, the file may be stored in a different directory.

    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

Additional resources

  • EdbMails OST to PST converter
  • 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
  • Convert OST files from all Outlook and Exchange versions
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 In this manual

IntroductionFree OST File Viewer Tool Steps to View OST FileBenefits of EdbMailsAdvantages of EdbMailsFAQs

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