EdbMails EDB Recovery and Migration software
  • Products
    EdbMails
    All-in-one Recovery and Migration
    • EDB Recovery and Migration
    • OST, PST, MBOX, NSF, EML, MSG
    • Office 365, Exchange Migration
    • SharePoint, OneDrive & Teams
    • Google Workspace Migration
    • IMAP Migration
    • Duplicate Remover
    • EdbMails Data Recovery
    • Backup Solutions
    • All ProductsAll Products

    EDB Recovery and Migration

    EdbMails lets you recover corrupted, damaged, and offline Exchange EDB files, convert EDB mailboxes to PST format, and directly migrate mailbox data to Office 365 and live Exchange Server.

    EDB to PST
    EDB to PST
    Recover corrupted, damaged, offline EDB files and convert Exchange EDB mailboxes to PST file format
    Public Folder to Exchange
    Public Folder to Exchange
    Migrate public folders from an Exchange offline EDB file to live Exchange Server
    EDB to Live Exchange Migration
    EDB to Live Exchange Migration
    Directly migrate offline Exchange database (EDB) files to live Exchange server
    Archive Mailbox to Office 365
    Archive Mailbox to Office 365
    Migrate archive mailboxes from offline EDB files directly to Office 365
    EDB to Office 365 Migration
    EDB to Office 365 Migration
    Directly migrate offline Exchange database (EDB) files to Office 365
    Public Folder to Office 365
    Public Folder to Office 365
    Migrate public folders from an offline Exchange EDB file to Office 365

    OST, PST, MBOX, NSF, EML, MSG Export and Migration

    EdbMails lets you to recover OST and PST files, export OST, PST, MBOX, NSF, EML, and MSG files to PST files, and directly migrate OST, PST, MBOX, and NSF mailbox data to Office 365 and live Exchange Server.

    OST Recovery and Migration
    OST Recovery and Migration
    Recover offline OST files, convert OST to PST, and migrate OST to Office 365 and Exchange Server
    PST Recovery and Migration
    PST Recovery and Migration
    Recover Outlook PST files , Export PST to PST, migrate PST to Office 365 and Exchange Server
    MBOX Export and Migration
    MBOX Export and Migration
    Export MBOX to PST, migrate MBOX to Office 365 and Exchange Server
    NSF Export and Migration
    NSF Export and Migration
    Export NSF to PST, migrate NSF to Office 365 and Exchange Server
    EML to PST Export
    EML to PST Export
    Convert EML files to Outlook PST files
    PST to MSG Export
    PST to MSG Export
    Convert Outlook PST file to MSG file format
    MSG to PST Export
    MSG to PST Export
    Export MSG files to Outlook PST files

    Office 365, Exchange Migration

    EdbMails lets you securely migrate mailboxes across Microsoft 365, Exchange, Google Workspace (Google Workspace Migraton), and IMAP-supported servers such as Outlook, Gmail, Zimbra, Zoho Mail, and cPanel, ensuring zero downtime.

    Office 365 Backup
    Office 365 Migration
    Migrate between Office 365 tenants, Office 365 to Exchange, Office 365 to PST, PST files to Office 365.
    Exchange Server Backup
    Exchange Migration
    Migrate between any Exchange Servers, Exchange to Office 365, Exchange to PST, PST files to Exchange.
    Tenant to Tenant Migration
    Tenant to Tenant Migration
    Migrate Mailboxes, Public Folders, Archive Mailboxes between Office 365 Tenants.
    Exchange to Office 365
    Exchange to Office 365
    Migrate Mailboxes, Public Folders, Archive Mailboxes from live Exchange server to Office 365.
    Office 365 to IMAP
    Office 365 to IMAP
    Migrate Office 365 to IMAP, Office 365 to Gmail, Office 365 to Outlook, Office 365 to Zoho etc.
    Exchange to IMAP
    Exchange to IMAP
    Migrate from live Exchange Server to IMAP servers such as Gmail, Outlook, and Zoho Mail.
    Public Folder to Office 365
    Public Folder to Office 365
    Migrate Public Folders between Office 365 tenants with complete folder hierarchy and mailbox data integrity.
    Exchange to PST
    Exchange to PST
    Export live Exchange Server mailboxes, public folders, and archive mailboxes to Outlook PST files.

    SharePoint, OneDrive & Microsoft Teams Migration

    EdbMails lets you migrate SharePoint sites, OneDrive data, Microsoft Teams, teams, channels, chats, permissions, and documents between Microsoft 365 tenants while maintaining the existing folder structure and data integrity.

    SharePoint, OneDrive & Teams Backup
    SharePoint Online Migration
    Migrate documents, lists, files and folders from SharePoint sites.
    OneDrive for Business Migration
    OneDrive for Business Migration
    Migrate documents, lists, files, folders, private chats from OneDrive.
    Microsoft Teams Migration
    Microsoft Teams Migration
    Migrate Teams, chats, channels, documents, files and folders etc.

    Google Workspace / G Suite Migration

    EdbMails offers secure Google Workspace migration to Office 365, Exchange, or IMAP, and export to PST covering emails, contacts, calendars and tasks.

    Google Workspace Migration
    Google Workspace Migration
    Migrate emails, calendars, contacts, tasks from Google workspace to Google workspace, office 365, Exchange and IMAP. Export to PST
    Google Workspace to Office 365
    Google Workspace to Office 365
    Migrate emails, calendars, contacts, tasks from Google Workspace / G Suite to Office 365
    Google Workspace to Exchange Server
    Google Workspace to Exchange Server
    Migrate emails, calendars, contacts, tasks from Google Workspace / G Suite to on-Premise Exchange Server
    Google Workspace to IMAP
    Google Workspace to IMAP
    Migrate emails, calendars, contacts, tasks from Google Workspace / G Suite to IMAP, Outlook, Zimbra, Zoho etc.
    Google Workspace to Google Workspace Migration
    Google Workspace to Google Workspace
    Migrate emails, calendars, contacts, tasks between two Google Workspace / G Suite tenants
    Google Workspace to PST
    Google Workspace to PST
    Export emails, calendars, contacts, tasks from Google Workspace / G Suite to Outlook PST files

    IMAP Migration

    EdbMails IMAP Migration tool lets you easily migrate emails from IMAP servers such as Outlook, Gmail, Zoho Mail, Zimbra, cPanel, and more. Supports IMAP to IMAP, Office 365, Exchange Server, PST, and bulk PST to IMAP migration.

    IMAP Email Backup & Migration
    IMAP Email Backup & Migration
    Backup and migrate emails from IMAP servers to PST, Office 365, and On-Premises Exchange Server
    IMAP to Office 365
    IMAP to Office 365
    Migrate emails, folders, and attachments from IMAP servers to Office 365
    IMAP to Exchange
    IMAP to Exchange
    Migrate emails, folders, and attachments from IMAP servers to on-premises Exchange Server
    IMAP to PST
    IMAP to PST
    Export emails, folders, and attachments from IMAP servers to Outlook PST files for backup
    PST to IMAP
    PST to IMAP
    Migrate emails, folders, and attachments from bulk PST files to IMAP servers

    Duplicate Remover

    EdbMails Duplicate Remover lets you easily remove duplicate items from Office 365 and Exchange Server, and from IMAP, Outlook, Gmail, Zimbra, Zoho Mail, etc., ensuring a clean and organized mailbox.

    Remove Duplicates
    Remove Duplicates
    Easily clean up your Office 365, Exchange, Outlook and IMAP accounts by removing duplicate emails.
    Remove Duplicates from Office 365
    Remove Duplicates from Office 365
    Remove duplicate emails, calendars, contacts, journal tasks, etc. from Office 365.
    Remove Duplicates from Exchange Server
    Remove Duplicates from Exchange Server
    Remove duplicate emails, calendars, contacts, journal tasks, etc. from live Exchange Server.
    Remove Duplicates from IMAP, Outlook
    Remove Duplicates from IMAP, Outlook
    Remove duplicate emails, attachments from IMAP, Outlook, Gmail, Zimbra, Zoho Mail etc.

    Exchange, SharePoint, OneDrive, Teams and Office 365 Backup

    EdbMails enables secure, automated backup and recovery for Microsoft 365 services including Exchange Online, SharePoint, OneDrive, Teams, and Live Exchange Server with complete data protection and restore flexibility.

    Office 365 Backup
    Office 365 Backup
    Incremental, Granular, Encrypted and Compressed Office 365 Mailboxes Backup
    Exchange Server Backup
    Exchange Server Backup
    Incremental, Granular, Encrypted and Compressed Exchange Mailboxes Backup
    SharePoint, OneDrive & Teams Backup
    SharePoint, OneDrive & Teams Backup
    Backup Online site collections, Team sites, Office 365 groups, all documents etc.

    EdbMails Data Recovery

    EdbMails Data Recovery Software lets you recover permanently deleted data, including photos, videos, documents, and archived files, from partitions on hard drives, SSDs, USB drives, SD cards, and external storage devices.

    EdbMails Data Recovery
    EdbMails Data Recovery
    Recover and restore permanently deleted data from hard drives, SSDs, USB drives, SD cards, and etc.
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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 - FAQs
    • OST to Office 365 Migration
    • OST to Exchange Migration
  • Videos
    • OST to PST - Video
    • OST to Office 365 Migration
    • OST to Exchange Migration
  • Screenshots
    • OST to PST - Sceenshots
    • OST to Office 365 Migration
    • OST to Exchange Migration
  • How it works?
    • OST to PST - Guide
    • 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
    • Recover Password Protected OST File
    • Recover Archived Mailbox from OST
    • Recover OST File After Exchange Server Failure
    • Recover Deleted OST After Outlook Profile Deletion
    • Recover Outlook Mailbox from OST File
    • Export Shared Mailbox from OST
    • Export OST with Date Filter
    • Restore Orphaned OST to Exchange Server
    • Export OST with Date Filter
    • Recover Mailbox After Exchange Migration Failure
    • Fix Outlook OST Compatibility Issues
    • Recover Outlook Mailbox After Windows Upgrade
    • OST Recovery Software vs Manual Methods
    • How Outlook Stores Mailbox Data in OST
    • When Outlook Creates an OST File
    • Common Causes of OST Corruption
    • Recover Mailbox After Exchange Mailbox Deletion
    • Recover Mailbox From Disconnected Exchange Account
    • Restore Mailbox After Exchange Database Failure
    • Recover Mailbox After Microsoft 365 Account Removal
    • Restore OST File on New Drive
  • 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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  2. OST Recovery and Migration
  3. OST to PST Knowledge Base - OST Recovery & Outlook Guides | EdbMails
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OST Recovery and OST to PST Knowledge Base

The EdbMails OST Recovery and OST to PST Knowledge Base provides step-by-step guides for recovering, opening, repairing and converting Outlook OST files. Find solutions for corrupt, orphaned, inaccessible and encrypted OST files, Outlook synchronization and data-file errors, deleted profiles and mailboxes, selective OST export, and OST recovery after Exchange or Microsoft 365 failures.

If you need to recover an OST file and convert it to PST immediately, see the EdbMails OST to PST Converter for the product overview, free trial and pricing.

EdbMails OST to PST Converter

Recover corrupt, orphaned or inaccessible OST files, preview mailbox data and convert required folders and items to Outlook PST — with no source file size limit.

View OST to PST Converter →

Popular OST Guides

OST to PST Converter Product overview, free trial, pricing and all recovery options.
How to Convert OST to PST Step-by-step guide to converting OST files to Outlook PST.
Recover Corrupt OST File Recover emails and data from damaged or inaccessible OST files.
Recover Orphaned OST File Open and export an OST without the original Outlook profile or Exchange account.
Open OST File Without Outlook Browse and read OST file contents without a live Outlook installation.
Recover OST After Profile Deletion Restore mailbox data when the Outlook profile has been deleted or lost.

OST to PST Conversion & Export Guides

OST to PST Converter

Recover corrupt, orphaned or inaccessible OST files, preview mailbox data and convert required folders and items to Outlook PST.

View OST to PST Converter →
  • How to Convert OST to PST
    Complete step-by-step walkthrough for converting an OST file to Outlook PST format using EdbMails.
  • Convert Unlimited OST Files to PST
    Process multiple OST files in a single session with no file size or quantity restrictions.
  • Selective OST to PST Export
    Export only the required OST folders and mailbox items instead of converting the complete mailbox.
  • Export OST to PST with Date Filter
    Filter OST content by date range, sender, recipient or subject before conversion to reduce output size.
  • Granular OST Recovery and Export
    Select and export individual emails, contacts, calendar items and tasks at item level.
  • Recover OST Metadata and Attachments
    Preserve sender, recipient, subject, dates and all attachments during OST recovery and PST conversion.
  • Export Emails, Contacts and Calendars from OST
    Selectively export any mailbox item type from a recovered OST to a new PST file.
  • Free OST File Viewer
    Preview the full OST mailbox — emails, folders, contacts and attachments — before starting conversion.
  • Split Large OST Conversion into Multiple PST Files
    Break a large OST conversion output into smaller, manageable PST files to avoid oversized Outlook data files.
  • OST Conversion Log and Export Report
    Review the detailed conversion log to verify which items were successfully recovered and exported.
  • Import Recovered OST Data into Outlook
    Open the converted PST in Outlook or import recovered mailbox items into an active Outlook profile.

Corrupt & Damaged OST File Recovery

  • Recover Corrupt OST File
    Learn how to recover emails, contacts, calendars and attachments from damaged or inaccessible Outlook OST files.
  • Common Causes of OST Corruption
    Understand why OST files become corrupt — from sudden shutdowns and sync failures to ransomware and storage errors.
  • Rebuild OST File
    Rebuild or recreate an OST file when the existing file is too damaged for normal Outlook-side repair.
  • Repair Corrupted Microsoft 365 / Outlook OST
    Steps for repairing OST files associated with Microsoft 365 or on-premises Outlook profiles.
  • Errors Have Been Detected in the OST File
    Fix the "errors have been detected" Outlook data file error and recover accessible mailbox items.
  • Recover Password-Protected OST File
    Open and recover supported password-protected OST files and export the contents to PST.
  • Recover Encrypted OST File
    Recover supported encrypted OST files and preview recoverable items before exporting to PST format.
  • OST Data File Cannot Be Configured
    Resolve the "OST data file cannot be configured" Outlook error and recover mailbox data from the affected file.

Orphaned & Disconnected OST Recovery

  • Recover Orphaned OST File
    Recover mailbox data when the original Outlook profile, Exchange account or server connection is no longer available.
  • Recover OST After Outlook Profile Deletion
    Restore mailbox contents from an OST file after the associated Outlook profile has been deleted or lost.
  • Recover Outlook Mailbox from OST
    Extract and restore the full Outlook mailbox from a local OST file without reconnecting to the server.
  • Recover Mailbox After Exchange Mailbox Deletion
    Recover mailbox data from an OST file when the Exchange mailbox has been deleted or deprovisioned.
  • Recover Mailbox from Disconnected Exchange Account
    Access and export mailbox items from an OST file tied to a disconnected or decommissioned Exchange account.
  • Recover Mailbox After Microsoft 365 Account Removal
    Use the local OST file to recover emails and data after a Microsoft 365 account has been removed or expired.
  • Restore OST File on a New Drive
    Move and recover an OST file onto a different drive or machine without access to the original Exchange server.
  • Recover Mailbox After Exchange Migration Failure
    Retrieve mailbox items from an OST file when an Exchange migration has failed or left data behind.
  • Recover Mailbox After Exchange Server Failure
    Access and export OST mailbox content when the Exchange server is unavailable, crashed or decommissioned.
  • Restore Mailbox After Exchange Database Failure
    Recover individual mailbox items from an OST file when the Exchange mailbox database is corrupt or offline.

Outlook OST Errors & Troubleshooting

  • Outlook OST Cannot Be Accessed
    Fix the "OST cannot be accessed" error and recover mailbox data from the affected file when Outlook cannot open it.
  • Outlook Data File Cannot Be Accessed
    Resolve access errors on Outlook data files and recover items when normal repair steps fail.
  • Outlook Not Connecting to Server
    Troubleshoot Exchange and Microsoft 365 connection failures and recover offline OST data when the server is unreachable.
  • Outlook Set of Folders Cannot Be Opened
    Fix the "set of folders cannot be opened" Outlook error and access mailbox data from the underlying OST.
  • Outlook Not Syncing
    Identify and resolve Outlook synchronization failures that leave OST data out of date or inaccessible.
  • Outlook Inbox Not Updating
    Troubleshoot an Outlook inbox that stops receiving new messages and recover any affected offline data.
  • Mailbox Temporarily Moved on Exchange Server
    Understand and resolve the "mailbox temporarily moved" error and recover mail from the local OST during migration.
  • Outlook Data File Cannot Be Configured
    Fix data file configuration errors that prevent Outlook from opening the OST or creating a new profile.
  • OST Compatibility Issues
    Resolve ANSI, Unicode and version-related OST compatibility problems that prevent normal file access.
  • Errors Detected in OST
    Diagnose and fix detected data errors in an OST file and recover accessible mailbox items to PST.
  • Outlook Cached Exchange Mode
    Understand how Cached Exchange Mode creates and uses OST files and what to do when the cache becomes corrupt.

Understand Outlook OST Files

  • What Is an OST File?
    Learn what an Outlook OST file is, how it is used and why it contains your offline mailbox data.
  • How Outlook Stores Mailbox Data in OST
    Understand the internal structure of an OST file and how Outlook synchronises it with Exchange or Microsoft 365.
  • When Outlook Creates an OST File
    Find out which Outlook account types trigger OST file creation and where the file is stored by default.
  • Outlook Cached Exchange Mode
    Explore how Cached Exchange Mode works, its benefits for offline access and how it relates to the OST file.
  • ANSI and Unicode OST Format
    Learn the differences between ANSI and Unicode OST file formats and which Outlook versions create each type.
  • OST Compatibility Issues
    Identify and resolve format and version compatibility issues that prevent an OST file from opening correctly.
  • Open OST File in Outlook
    Steps for opening an existing OST file in Outlook when the associated profile is still available.
  • Import OST File into Outlook
    How to import data from a recovered or converted OST file back into an active Outlook profile.

OST Mailbox & Data Recovery Scenarios

  • Recover Deleted Mailboxes from OST
    Extract and restore deleted mailbox data from an OST file after account deletion or administrative removal.
  • Recover Archived Mailbox from OST
    Access and export archive mailbox content stored in an OST file no longer connected to a live account.
  • Export Shared Mailbox from OST
    Recover and export shared mailbox items stored in an OST file to a PST for access outside Outlook.
  • Recover Metadata and Attachments
    Ensure email headers, properties and file attachments are preserved intact during OST recovery and conversion.
  • Recover Email, Contacts and Calendars
    Selectively recover and export emails, calendar entries, contacts and tasks from a disconnected or corrupt OST.
  • Recover Outlook Mailbox after Windows Upgrade
    Restore Outlook mailbox data from an OST file that became inaccessible following a Windows upgrade or OS reinstall.
  • Save Outlook Emails to Hard Drive
    Export and save individual Outlook emails or full mailbox folders from an OST file to local storage.
  • Recover Deleted OST Items
    Scan the OST file for recoverable deleted emails, contacts, calendar items and folders before exporting to PST.

OST Migration to Microsoft 365 & Exchange

  • OST to Microsoft 365 Migration
    Migrate recovered OST mailbox items directly to Microsoft 365 without creating an intermediate PST file.
  • OST to Exchange Server Migration
    Recover and migrate OST mailbox content directly to a supported Exchange Server environment.
  • Restore Orphaned OST to Exchange Server
    Reconnect and migrate an orphaned OST file back to an Exchange Server mailbox after profile loss or server failure.

Related Main OST Resources

OST to PST ConverterProduct overview, pricing and free trial How to Convert OST to PSTStep-by-step conversion guide Repair Corrupt OST FileRecover damaged OST mailbox data Recover Orphaned OSTOpen disconnected or offline OST files OST to PST Converter FeaturesFull capability and feature overview Granular RecoveryItem-level export and folder selection Free TrialTry the converter at no cost OST to PST FAQsAnswers to common questions

 In this manual

IntroductionPopular OST GuidesOST to PST Conversion GuidesCorrupt OST File RecoveryOrphaned OST RecoveryTroubleshooting OST ErrorsUnderstand Outlook OST FilesOST Recovery ScenariosOST MigrationRelated OST Resources

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