Is Outlook required to convert OST to PST?

EdbMails can scan, recover and preview an OST without Outlook. A supported Outlook installation with a configured profile is required when exporting the recovered items to PST. Outlook is not required for direct OST to Microsoft 365 or Exchange migration.

Can EdbMails convert corrupt OST files?

Potentially. EdbMails scans corrupt, damaged and inaccessible OST files and exports mailbox data that remains readable. Severe corruption can leave some folders, items or properties unavailable.

Can I convert an orphaned OST file to PST?

Yes. If an orphaned OST contains readable mailbox data, EdbMails can scan it independently of the original profile and export selected content to PST.

Can I preview OST data before conversion?

Yes. After scanning, you can preview readable folders and supported mailbox items before choosing what to export.

Can I convert an OST file if the original Exchange or Microsoft 365 account has been deleted?

Yes, when the surviving OST contains readable data. EdbMails scans the file independently of the live account and can export the readable selected content to PST.

Can EdbMails split a large output PST?

Yes. EdbMails can split PST output according to the supported output-size settings. Validate representative folders and item counts after export.

Can I convert only specific folders instead of the entire OST file?

Yes. You can preview the folder tree and select individual folders or supported mailbox items rather than exporting the entire OST.

Does EdbMails recover deleted OST items?

EdbMails can recover deleted items only when the underlying mailbox data remains present and readable in the OST. Permanently absent or overwritten data cannot be reconstructed from the file.

Are attachments and email metadata preserved?

Supported attachments, folder hierarchy, email properties, timestamps and metadata are preserved where those elements remain present and readable in the source OST.

Do I need administrator or Exchange Impersonation rights to convert an OST file?

No Exchange or Microsoft 365 administrative rights are required for local OST scanning and PST export. Direct migration destinations require the permissions and authentication applicable to the selected target workflow.

How many items does the free version convert?

The free trial exports up to 30 items per folder, allowing representative validation before licensing.

Which Outlook versions are supported?

Use the current EdbMails supported-platforms and system-requirements page for the supported Windows and Outlook versions.

Can I migrate OST directly to Microsoft 365 or Exchange?

Yes. EdbMails provides separate direct-migration workflows for Microsoft 365 and supported Exchange targets when PST is not required. Target authentication and permissions depend on the destination and current product build.

Will converting my OST to PST affect the original file?

EdbMails writes recovered data to a separate PST output rather than converting the source OST in place. For important recovery cases, keep the original OST unchanged and work from a preserved copy whenever possible.

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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 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

Recover corrupted, damaged, offline EDB files and convert Exchange EDB mailboxes to PST file format

Public Folder to Exchange

Migrate public folders from an Exchange offline EDB file to live Exchange Server

EDB to Live Exchange Migration

Directly migrate offline Exchange database (EDB) files to live Exchange server

Archive Mailbox to Office 365

Migrate archive mailboxes from offline EDB files directly to Office 365

EDB to Office 365 Migration

Directly migrate offline Exchange database (EDB) files 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

Recover offline OST files, convert OST to PST, and migrate OST to Office 365 and Exchange Server

PST Recovery and Migration

Recover Outlook PST files , Export PST to PST, migrate PST to Office 365 and Exchange Server

MBOX Export and Migration

Export MBOX to PST, migrate MBOX to Office 365 and Exchange Server

NSF Export and Migration

Export NSF to PST, migrate NSF to Office 365 and Exchange Server

EML to PST Export

Convert EML files to Outlook PST files

PST to MSG Export

Convert Outlook PST file to MSG file format

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 (G Suite), and IMAP-supported servers such as Outlook, Gmail, Zimbra, Zoho Mail, and cPanel, ensuring zero downtime.

Office 365 Migration

Migrate between Office 365 tenants, Office 365 to Exchange, Office 365 to PST, PST files to Office 365.

Exchange Migration

Migrate between any Exchange Servers, Exchange to Office 365, Exchange to PST, PST files to Exchange.

Tenant to Tenant Migration

Migrate Mailboxes, Public Folders, Archive Mailboxes between Office 365 Tenants.

Exchange to Office 365

Migrate Mailboxes, Public Folders, Archive Mailboxes from live Exchange server to Office 365.

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

Migrate from live Exchange Server to IMAP servers such as Gmail, Outlook, and Zoho Mail.

Public Folder to Office 365

Migrate Public Folders between Office 365 tenants with complete folder hierarchy and mailbox data integrity.

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 Online Migration

Migrate documents, lists, files and folders from SharePoint sites.

OneDrive for Business Migration

Migrate documents, lists, files, folders, private chats from OneDrive.

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

Migrate emails, calendars, contacts, tasks from Google Workspace to Google Workspace, office 365, Exchange and IMAP. Export to PST

Google Workspace to Office 365

Migrate emails, calendars, contacts, tasks from Google Workspace / G Suite to Office 365

Google Workspace to Exchange Server

Migrate emails, calendars, contacts, tasks from Google Workspace / G Suite to on-Premise Exchange Server

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

Migrate emails, calendars, contacts, tasks between two Google Workspace / G Suite tenants

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

Backup and migrate emails from IMAP servers to PST, Office 365, and On-Premises Exchange Server

IMAP to Office 365

Migrate emails, folders, and attachments from IMAP servers to Office 365

IMAP to Exchange

Migrate emails, folders, and attachments from IMAP servers to on-premises Exchange Server

IMAP to PST

Export emails, folders, and attachments from IMAP servers to Outlook PST files for backup

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

Easily clean up your Office 365, Exchange, Outlook and IMAP accounts by removing duplicate emails.

Remove Duplicates from Office 365

Remove duplicate emails, calendars, contacts, journal tasks, etc. from Office 365.

Remove Duplicates from Exchange Server

Remove duplicate emails, calendars, contacts, journal tasks, etc. from live Exchange Server.

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

Incremental, Granular, Encrypted and Compressed Office 365 Mailboxes Backup

Exchange Server Backup

Incremental, Granular, Encrypted and Compressed Exchange Mailboxes 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

Recover and restore permanently deleted data from hard drives, SSDs, USB drives, SD cards, and etc.

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OST to PST Converter

Recover OST Files with EdbMails OST to PST Converter

EdbMails OST to PST Converter scans healthy, offline, orphaned, inaccessible, corrupt, or damaged OST files and recovers mailbox data that remains present and readable in the source. It can recover data from offline or orphaned OST files without connecting to the original Exchange Server, Windows domain, or Outlook profile. Preview the mailbox data detected in the OST and export supported emails, attachments, contacts, calendars, tasks, folder hierarchy, and message properties to PST.

Recover corrupt, orphaned and inaccessible OST files
Preview OST mailbox data before conversion
Convert multiple OST files with no source file-size restriction
Preserve folder hierarchy, attachments and email metadata
Recover deleted mailbox items where recoverable
Convert up to 30 items from every folder with the free trial
Free 24/7 technical support

Just $45 Onwards

OST to Office 365 Migration OST to Exchange Migration Repair OST file Outlook PST Repair tool PST to Office 365 migration PST to Exchange migration

OST to PST Converter Now on Azure Marketplace!

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When Do You Need OST to PST Converter?

Corrupt OST File

Recover mailbox data when Outlook cannot open or synchronize the OST file.

Orphaned OST File

Access OST data when the original Outlook profile or mailbox no longer exists.

Exchange Server Failure

Recover mailbox data without connecting to the original Exchange Server.

Deleted User or Profile

Retrieve mailbox data from OST files belonging to deleted accounts or profiles.

Move Recovered Outlook Data to Another Computer

Convert readable OST data to PST and open or import the resulting file in a supported Outlook environment.

Keep a Portable Copy of OST Data

Save Outlook mailbox data in PST format for portable access and long-term use.

Choose the Right OST Recovery Path Before You Convert

An OST file is normally a synchronized local copy of a mailbox. If the original Exchange or Microsoft 365 mailbox is still available and contains everything you need, reconnecting the account or rebuilding the OST is usually the first option. Conversion becomes important when the file is orphaned, the profile or mailbox is unavailable, Outlook cannot open the OST, or locally cached data must be recovered independently.

Your situation	Recommended first action	When EdbMails is appropriate
Mailbox and Outlook profile are working	Use Outlook export when a PST copy is genuinely required.	Use EdbMails when you need independent file recovery or more selective recovery options.
OST is stale but the server mailbox is healthy	Rebuild or resynchronize the OST.	Use recovery if the old OST may contain unsynchronized local data.
Mailbox or profile has been deleted	Preserve the original OST before making changes.	Scan the orphaned OST, preview recoverable data and export required items.
Outlook reports corruption or cannot open the file	Work from a copy and try the least-destructive native option first.	Use EdbMails when native repair or recreation cannot restore the required data.

Why Choose EdbMails OST to PST Converter?

Recover Corrupt and Orphaned OST Files

Recover mailbox data even when the original Exchange mailbox or Outlook profile is unavailable.

Preview Before You Convert

Open and inspect emails, contacts, calendars, attachments and folders before exporting anything.

Convert Multiple OST Files

Process multiple OST files without an application-imposed source OST size cap. Practical processing depends on source condition, storage, system resources, Outlook/PST constraints, and the current EdbMails build.

Granular Mailbox Recovery

Select individual folders and mailbox items instead of converting the entire OST.

Preserve Supported Outlook Mailbox Data

Preserve supported folder hierarchy, email properties, attachments, timestamps and relevant metadata where those elements remain present and readable in the source OST.

Multiple Recovery Destinations

Convert OST to PST or migrate recovered OST data directly to Microsoft 365 and Exchange Server.

Outlook Manual Method vs EdbMails

Capability	Outlook / Native Approach	EdbMails OST to PST Converter
Healthy mailbox and active profile	Use Outlook export or rebuild/resync the OST when appropriate.	Use EdbMails when independent OST recovery is actually required.
Corrupt or inaccessible OST	Try the least-destructive supported Outlook/profile repair or rebuild path first.	Scans the preserved OST and exposes data that remains readable.
Orphaned OST / deleted profile	No normal standalone Outlook attach/import path for an arbitrary orphaned OST.	Scans independently of the original profile and exports readable data to PST.
Preview before export	Available when Outlook can open the mailbox/data source normally.	Preview readable OST folders and items before PST export.
Selective recovery/export	Depends on what Outlook can open and export.	Select required folders or items before export.
Multiple OST processing	Manual per-source workflows.	Supports managed processing of multiple OST sources.
Deleted item recovery	Depends on mailbox/server retention and what Outlook can access.	Can recover deleted items that remain present and readable in the OST.
Direct Microsoft 365 / Exchange migration	Not an OST attach/import workflow.	Available as separate direct-migration destinations when PST is not required.

EdbMails OST to PST Converter: Key Features

Split PST files from large OST files

EdbMails lets you split the PST output generated from a large OST into multiple smaller PST files based on the selected output size. This changes the PST output layout; it does not split or shrink the source OST.

Granular recovery and OST to PST conversion

EdbMails supports granular recovery of OST files at the item level. Pick specific emails, calendar entries, contacts, folders or notes and convert just those, instead of moving the whole mailbox.

Save Recovered OST Data in Multiple Formats

EdbMails lets you save supported readable OST data in EML, HTML and MHT in addition to PST. Use the output format that matches the intended application or review workflow.

Detailed OST to PST export report

EdbMails generates a detailed export report at the end of each run, covering item counts, mailbox details and a folder-by-folder breakdown of what came across.

Scan OST without the Original Exchange Profile

EdbMails can scan, recover and preview an OST without the original Exchange profile or live Exchange connection. A supported Outlook installation with a configured profile is required when writing the recovered data to PST.

Convert ANSI and Unicode OST Files

EdbMails supports ANSI and Unicode OST formats. Review the detected source data and validate representative output after conversion.

Handle OST Access and Protection Issues Correctly

OST files do not use a normal user-set PST-style file password. If access is blocked by account credentials, Windows EFS, BitLocker, ransomware, or another protection layer, authorized access to that layer is required before EdbMails can scan the OST. The converter does not bypass external encryption or authentication controls.

OST to PST Converter Steps

1
Download EdbMails
Download and install EdbMails OST to PST Converter.
2
Select the OST File
Browse and add the offline OST file you want to recover.
3
Preview and Select Mailbox
Preview recovered folders and choose the items you want to export.
4
OST to PST Converter
Select PST as the destination and start the conversion.

View Complete Step-by-Step OST to PST Guide

OST Recovery and Migration Scenarios

Recover Data from Corrupt OST Files

If Outlook cannot open or rebuild the required data from the live mailbox, EdbMails can scan a preserved corrupt or damaged OST file and recover mailbox data that remains readable. Severe corruption can limit which folders, items, or properties are recoverable.

Export Data from Orphaned OST Files

When an OST becomes disconnected from the mailbox/profile that created it and required data is no longer available from the server, EdbMails can scan the orphaned OST, preview readable data, and export the selected content to PST or another supported format.

Recover readable OST data after ransomware

If an OST file has been affected by ransomware or malware, first ensure that the file is accessible and safe to scan. EdbMails can recover mailbox data that remains present and readable in the OST file; the results depend on the extent of file damage or encryption. The converter does not bypass ransomware encryption or external security controls and helps export available mailbox data from readable OST files into PST format while preserving supported mailbox folders and items.

Preserve Unique OST Data Before Rebuilding Outlook

If the live mailbox is healthy, Outlook should normally rebuild or resynchronize the OST from the server. Use EdbMails first only when the old OST may contain required local data that the server cannot provide; export that readable data to PST before replacing the old cache.

Move Recovered Outlook Data to a Portable PST

When mailbox data is stranded in an OST and a portable Outlook data file is required, EdbMails can convert readable content to PST for use in a supported Outlook workflow. PST is an Outlook data format, so other email clients may require their own import or conversion process.

Create a Portable PST from Older OST Data

If older mailbox data exists in the OST and a separate Outlook data file is required, EdbMails can export readable content to PST while preserving supported properties where available. The resulting PST can be used for recovery, review, or transfer, but it should not be treated as a substitute for an organization's Exchange/Microsoft 365 backup, retention, or disaster-recovery policy.

Recover Readable OST Data After a System Failure

After a system or application failure, first determine whether the live mailbox, backup, or server-side recovery source can provide the required data. If not, EdbMails can scan the surviving OST and export readable mailbox content to PST.

Recover OST Data for a New Computer

If the live mailbox is healthy, configure the account on the new computer and let Outlook create a new cache. If required data exists only in the old OST, EdbMails can export the readable content to PST and you can open or import the PST in a supported Outlook environment.

Handling offline access issues

When offline access breaks down due to OST corruption, Exchange downtime, or profile disconnection, EdbMails OST to PST Converter helps export readable mailbox data from accessible OST files into PST format. It allows users to access available mailbox items without requiring a live Exchange connection and helps during scenarios such as server issues, profile changes, or migration preparation.

Recovering deleted items

EdbMails OST to PST converter recovers deleted items from OST files, including emails, contacts, calendars, and mailbox content, even items that no longer show up in Outlook. The scan finds permanently deleted items that are still recoverable from the file system, so you can pull them back when needed. Once recovered, they save into PST for easy access, backup, or transfer to another Outlook profile or platform.

Fix Outlook not connecting to server error

The 'Outlook unable to connect to the server' error usually traces back to authentication failure with Exchange or to the email account being deleted on the server side. A corrupted or disconnected OST file after an Exchange crash can also block email access. EdbMails OST to PST Converter handles recovery and conversion by exporting the readable mailbox content to PST, using Outlook with a configured profile only for the PST write step, subject to the condition and contents of the source OST.

Recover OST Data When Sync Cannot Be Restored

Outlook synchronization problems should be diagnosed and repaired at the account, network, service, or profile level first. EdbMails does not repair live synchronization; it becomes relevant when required data is stranded in an old OST and must be recovered independently to PST.

Access Recovered OST Data in Outlook

Outlook does not provide a normal standalone import path for an arbitrary orphaned OST. EdbMails can scan corrupted, disconnected, or orphaned OST files and export readable supported data to PST. The resulting PST can then be opened or imported in a supported Outlook environment.

Recover Data When an Outlook Data File Cannot Be Accessed

The 'Outlook data file cannot be accessed' error can have several causes. Repair the live Outlook/profile problem first when possible. If the mailbox/profile cannot be restored and the old OST contains required data, EdbMails can scan the preserved file and export readable content to PST.

Free Trial for OST to PST Converter

Use the free trial to scan your OST file, preview recoverable mailbox items, and export up to 30 items per folder to PST.

Download Free View Pricing

Evaluate Recovery on Your Own OST Before Licensing

Scan

Add a copy of the source OST and allow EdbMails to identify readable folders and items.

Inspect

Preview important emails, attachments, contacts and calendar entries before choosing an export.

Test Export

Use the free allowance of up to 30 items per folder to create a representative PST.

Validate

Open the PST in a supported Outlook profile and verify folders, dates, attachments and item counts.

What Affects OST Recovery Results?

Recovery depends on the information that is actually present and readable in the source OST. Items that were never cached, data already overwritten, server-only settings, permissions, mailbox rules and Online Archive content not synchronized into the OST cannot be recreated from the local file alone. Severe corruption can also reduce the number of recoverable items or properties.

Recommended practice: Keep the original OST unchanged, scan a working copy, review the preview, export a representative sample and validate the resulting PST before performing a full recovery.

Supported OST Data for Recovery,
Export, and Migration

Availability depends on what is actually cached, present and readable in the source OST. Server-side directory objects, permissions, rules, retention settings and Online Archive content that was never cached in the OST cannot be recreated from the local file alone.

Data / Capability	PST Export	Microsoft 365 Direct	Exchange Direct
Emails and attachments	Supported when readable	Supported when readable	Supported when readable
Calendar items	Supported when present/readable	Supported when present/readable	Supported when present/readable
Contacts	Supported when present/readable	Supported when present/readable	Supported when present/readable
Tasks and notes	Supported when present/readable	Supported when present/readable	Supported when present/readable
Folder hierarchy and supported item properties	Preserved where available	Preserved where supported by the target	Preserved where supported by the target
Shared-mailbox data	Only when the required shared-mailbox content is actually cached and readable in the source OST.
Public Folder data	Only when the required Public Folder content is actually present in the source OST; do not assume all server-side Public Folder content is cached.
Online Archive / Archive mailbox	A separate Online Archive should not be assumed to exist in the primary OST. Use the server-side archive, retention, backup, or applicable source when available.
Deleted items	Recoverable only when the underlying item data remains present and readable in the OST.
Mailbox aliases, distribution groups, permissions, rules and server configuration	Not reconstructed as directory/server configuration from the OST file alone.
Selective folders / items	Supported	Supported where available in the workflow	Supported where available in the workflow
Incremental migration	Not applicable to local PST export	Available for supported repeat migration workflows	Available for supported repeat migration workflows
Migration reports	Export report	Migration report	Migration report

Technical Specifications Table

Specification	Supported / Compatible Versions
Source	Outlook OST
Output	PST, EML, HTML, MHT
OST Types	Exchange, Microsoft 365, and applicable Outlook-created OST files
OST Format	ANSI and Unicode
Outlook Versions	See current supported Outlook versions
Windows	See current supported Windows versions
Source File Size	No application-imposed source OST limit
Trial	30 items per folder
Outlook Requirement	Required for PST export

Evaluate EdbMails OST to PST Converter Before Full Export

Scan and preview readable OST data before committing to a full export
Local OST scanning does not require a connection to the original Exchange Server
Free trial exports up to 30 items per folder for validation

24/7 free technical support
Current product screenshots and step-by-step guides
Migration alternatives for Microsoft 365 and Exchange when PST is not the required outcome

View All OST to PST Converter Features

Frequently Asked Questions

Can I convert an OST file to PST without the original Exchange profile?
Yes. EdbMails can scan and preview an OST independently of the original Outlook profile or live Exchange connection. A supported Outlook installation with a configured profile is required when exporting the recovered data to PST.
Is Outlook required to convert OST to PST?
EdbMails can scan, recover and preview an OST file without Outlook. Microsoft Outlook with a configured profile is required only when exporting the recovered items to PST. Outlook is not required for direct OST to Microsoft 365 or Exchange migration.
Can EdbMails convert corrupt OST files?
Potentially. EdbMails scans corrupt, damaged and inaccessible OST files and exports mailbox data that remains readable. Severe corruption can leave some folders, items or properties unavailable. Recover a corrupt OST file.
Can I convert an orphaned OST file to PST?
Yes. If an orphaned OST contains readable mailbox data, EdbMails can scan it independently of the original profile and export the selected content to PST. Recover an orphaned OST file
Is there any OST file-size limitation?
EdbMails does not impose an application-level cap on the source OST size, and the source OST does not need to be split before scanning. For large files, plan sufficient storage, memory, system resources, processing time, and PST output capacity. Practical processing also depends on the source condition, Outlook/PST constraints, and the current EdbMails build.
Can I preview OST data before conversion?
Yes. Select the OST file and its contents display in the interface. Open any folder to preview emails with full headers, attachments, calendar entries and contacts before committing to the conversion. Free OST file viewer.
Can I convert an OST file if the original Exchange or Microsoft 365 account has been deleted?
Yes. Once an OST is orphaned, its parent mailbox no longer exists or is unreachable, EdbMails scans the file independently of any live server connection and exports its contents to PST, so a deleted or deprovisioned account doesn't block recovery.
Can EdbMails split a large output PST?
Yes. EdbMails can split PST output according to the supported output-size settings. Validate representative folders and item counts after export. Split PST output from a large OST.

Can I convert only specific folders instead of the entire OST file?
Yes. You can preview the OST's folder tree and select individual folders, or specific mailbox items, rather than exporting everything to PST.
Does EdbMails recover deleted OST items?
EdbMails can recover deleted items only when the underlying mailbox data remains present and readable in the OST. Permanently absent or overwritten data cannot be reconstructed from the file. Recover deleted OST items.
Are attachments and email metadata preserved?
Yes. Attachments, folder hierarchy, email properties, timestamps and message metadata are preserved through the conversion, where those properties remain present and readable in the source OST.
Do I need administrator or Exchange Impersonation rights to convert an OST file?
No Exchange or Microsoft 365 administrative rights are required for local OST scanning and PST export. If you choose direct migration to Microsoft 365 or Exchange instead, the target connection requires the permissions and authentication applicable to that workflow.
How many items does the free version convert?
The free trial exports up to 30 items per folder, covering emails, contacts, calendars, tasks and the rest. That is enough to validate recovery on your own data before buying a license.
Can I migrate OST directly to Microsoft 365 or Exchange?
Yes. EdbMails provides separate direct-migration workflows for Microsoft 365 and supported Exchange targets when PST is not required. Target authentication and permissions depend on the destination and current EdbMails build. Import OST to Microsoft 365.
Will converting my OST to PST affect the original file?
EdbMails writes recovered data to a separate PST output rather than converting the source OST in place. For important recovery cases, keep the original OST unchanged and work from a preserved copy whenever possible.
What Outlook and Windows versions does the converter support?
See the current supported platforms and system requirements for the supported Windows and Outlook versions.

More FAQs

Related OST recovery resources

EdbMails can also migrate recovered OST items directly to Microsoft 365 or Exchange, no PST in between.

OST to Office 365 Migration Import OST directly to Microsoft 365 OST to Exchange MigrationImport OST to live Exchange Server Repair Corrupt OST FileRecover damaged and inaccessible OST Recover Orphaned OSTAccess OST from deleted profiles Free OST File ViewerOpen OST without Outlook Outlook PST RecoveryRepair and recover PST files OST Knowledge BaseAll OST recovery articles Fix "Errors Detected in OST File"Resolve the common Outlook OST error message Fix "OST File Cannot Be Opened"Resolve the file-in-use access error Fix OST Compatibility IssuesResolve version-mismatch errors Rebuild an OST FileSafely recreate a corrupted OST Open and Access an OST FileUnderstand supported ways to inspect OST data OST Access and Protection IssuesUnderstand credentials, Windows encryption, and access controls Restore OST on a New DriveMove or recover OST after a hardware change Selective OST to PST ExportFilter by folder, sender, subject or date Bulk OST to PST ConversionConvert multiple OST files in one batch Split PST Output from a Large OSTManage large PST export output How Outlook Stores Data in OSTUnderstand Cached Exchange Mode Cached Exchange Mode ExplainedWhy an OST isn't a full mailbox backup OST Recovery Benchmark & Case StudyDocumented test conditions and a real-world recovery case study

Customer Testimonials

OST file conversion was done perfectly with EdbMails. The interface is simple and user-friendly, making it easy to use. By converting from .ost to .pst, I could securely maintain an archive of all my important emails, contacts, and calendar items. The application is incredibly handy, with reliable performance and quick conversion speeds that make managing my data efficient and hassle-free.

– Neil Simonds
Australia

I am quite impressed with EdbMails OST to PST converter. It includes a free OST file viewer, allowing you to easily select an offline OST file and preview all its contents. The free trial version provides a good overview of the features and lets you test the conversion process. If you need a quick solution to export OST files to PST and save in different formats like EML, HTML, and MHT, this tool does a great job.

– Neville Bowman
New Zealand

OST to PST file conversion is something I strongly recommend using EdbMails. The process was smooth and straightforward, allowing me to complete the conversion in just a few simple steps thanks to its intuitive, user-friendly interface. It’s clear that a lot of thought went into designing this application to make it accessible and effective. Kudos to the entire team for creating such a fantastic tool!

– John Walker
United States

I was able to recover all my emails from the OST file thanks to EdbMails OST to PST software. This tool easily retrieved even the most inaccessible or corrupted OST files and converted them to PST without data loss. It restored my entire mailbox, including emails, contacts, calendar entries, and attachments. The process was quick and straightforward, making it an excellent choice for anyone dealing with OST file issues.

– Blanca Floria
Spain

The best OST to PST converter tool, EdbMails offers excellent functionality at a surprisingly reasonable cost. As a non-technical user, I found it incredibly easy to use thanks to its intuitive graphical user interface (GUI). The software simplifies the entire conversion process, making it accessible for anyone, regardless of their technical expertise. With its powerful features and straightforward design, EdbMails makes converting OST files to PST an effortless task, all while providing great value for money.

– Valère Bret
France

EdbMails app has done wonders for converting OST files to PST. I’ve personally used this outstanding OST to PST conversion tool, and it exceeded my expectations. The software not only handled the conversion seamlessly but also preserved all my emails, attachments, contacts, and calendar entries without any data loss. The process was quick, efficient, and very easy to follow, making it a reliable solution for anyone looking to convert OST files. I highly recommend it for its excellent performance and user-friendly interface.

– Daley Morton
United Kingdom

I've been searching for a long time for a reliable solution to convert data from an offline OST file selectively. Thanks to this fantastic tool, I was able to export only the emails I needed within a specific date range from my offline OST files to PST format. The ability to filter and choose specific data made the process much more efficient, saving me time and effort. The tool’s flexibility and accuracy in handling selective conversion were impressive, and it made managing my email data much easier. I’m thoroughly satisfied with how simple and effective the entire process was.

– Kevin Hines
United States

The best application to recover an accidentally deleted Exchange mailbox! I used EdbMails to simply select the OST file from my computer and completely restore the deleted mailbox by converting it to PST. The process was smooth and efficient, and I was able to recover all my lost emails, contacts, and calendar entries with ease. This life saving software truly saved me, and I’m very satisfied with the results. EdbMails is a must-have tool for anyone dealing with Exchange mailbox recovery. It really puts a big smile on my face! :)

– Julián Gonsales
Mexico

I encountered an error every time I tried to open my OST file with Microsoft Outlook, which was preventing me from accessing important emails and data. I was frustrated and unsure how to resolve the issue, but thankfully, EdbMails OST to PST converter came to the rescue. This tool not only helped me recover my OST file but also allowed me to convert it to a PST file, which I could easily open and access in Outlook. I’m truly grateful for how smoothly and efficiently EdbMails solved my problem, allowing me to regain access to my data without any hassle.

– Liam Anderson
United States

I spent a lot of time trying different methods to convert my OST files to PST, but none of them seemed to work effectively. That was until I discovered this tool. It made the entire conversion process incredibly quick and hassle-free, saving me a significant amount of time and frustration. The simplicity and efficiency of this tool truly stand out, and I couldn’t be more pleased with the results. I highly recommend it to anyone facing similar challenges with OST to PST conversion—it’s a real game-changer!

– Harrison Wren
United Kingdom

I’ve been using EdbMails OST to PST Converter to recover and convert my Outlook data, and it has worked exceptionally well. The tool is highly reliable, with an intuitive interface that makes the entire conversion process straightforward. It efficiently handled my OST file issues, recovering everything from emails to contacts and calendar entries without any data loss. I highly recommend this tool for anyone dealing with OST file problems!

– Lennox Fraser
Canada

I’m very impressed with how this software performed. It smoothly converted my corrupted OST file to PST without any issues. The easy-to-use interface made the entire process straightforward, even for those without technical expertise. This tool is an excellent solution for anyone needing to convert OST files, and I highly recommend it for anyone facing similar challenges.

– Jaxon McLeod
Australia

I was struggling with a corrupted OST file and didn’t know how to recover my lost data. Thankfully, I came across EdbMails OST to PST Converter, and it turned out to be exactly what I needed. It quickly converted my damaged OST file into a fully accessible PST file, restoring all my emails, contacts, and attachments. The process was easy to follow, and the tool was incredibly reliable. I’m glad to have all my important data back, and the entire recovery process was straightforward.

– Thabo Mthembu
South Africa

I’m extremely satisfied with the OST to PST converter software I used. It was a true lifesaver, allowing me to effortlessly migrate all of my corrupted OST files—regardless of size—into the PST format. The process was quick and seamless, and I can now access all my previously inaccessible files without any issues. This tool handled everything efficiently, and I’m truly grateful for such an outstanding solution. Thank you!

– Marek Kowalski
Poland

One of the standout features of this software is its remarkable speed. It quickly converted my large OST file into PST format, saving me a significant amount of time. What impressed me even more was the accuracy of the conversion—everything was perfectly transferred without any data loss. Additionally, the customer support team at EdbMails was prompt, professional, and very helpful, ensuring a smooth experience from start to finish. I’m very pleased with both the software and the level of service provided.

– Anneliese Hoffmann
Germany

I had an excellent experience using EdbMails OST to PST Converter. This tool is efficient and easy to use, making the entire OST to PST conversion process quick and straightforward. I was particularly impressed with how it handled my massive 100GB OST file, converting all my data—emails, attachments, and contacts—without any loss. The intuitive interface made the process simple to follow. I highly recommend EdbMails to anyone needing an effective solution for converting large OST files to PST.

– Eliav Cohen
Israel

OST to PST Converter

Recover OST Files with EdbMails OST to PST Converter

Just $45 Onwards

When Do You Need OST to PST Converter?

Corrupt OST File

Orphaned OST File

Exchange Server Failure

Deleted User or Profile

Move Recovered Outlook Data to Another Computer

Keep a Portable Copy of OST Data

Choose the Right OST Recovery Path Before You Convert

Why Choose EdbMails OST to PST Converter?

Recover Corrupt and Orphaned OST Files

Preview Before You Convert

Convert Multiple OST Files

Granular Mailbox Recovery

Preserve Supported Outlook Mailbox Data

Multiple Recovery Destinations

Outlook Manual Method vs EdbMails

EdbMails OST to PST Converter: Key Features

Split PST files from large OST files

Granular recovery and OST to PST conversion

Save Recovered OST Data in Multiple Formats

Detailed OST to PST export report

Scan OST without the Original Exchange Profile

Convert ANSI and Unicode OST Files

Handle OST Access and Protection Issues Correctly

OST to PST Converter Steps

Download EdbMails

Select the OST File

Preview and Select Mailbox

OST to PST Converter

OST Recovery and Migration Scenarios

Recover Data from Corrupt OST Files

Export Data from Orphaned OST Files

Recover readable OST data after ransomware

Preserve Unique OST Data Before Rebuilding Outlook

Move Recovered Outlook Data to a Portable PST

Create a Portable PST from Older OST Data

Recover Readable OST Data After a System Failure

Recover OST Data for a New Computer

Handling offline access issues

Recovering deleted items

Fix Outlook not connecting to server error

Recover OST Data When Sync Cannot Be Restored

Access Recovered OST Data in Outlook

Recover Data When an Outlook Data File Cannot Be Accessed

Free Trial for OST to PST Converter

Evaluate Recovery on Your Own OST Before Licensing

Scan

Inspect

Test Export

Validate

What Affects OST Recovery Results?

Supported OST Data for Recovery,Export, and Migration

Technical Specifications Table

Evaluate EdbMails OST to PST Converter Before Full Export

Frequently Asked Questions

Related OST recovery resources

Customer Testimonials

Get Started Now!

Convert OST to PST with Accuracy and Ease

Supported OST Data for Recovery,
Export, and Migration