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OST Recovery Tool (2026 Enterprise Edition)

Free trial Buy License $49

OST Recovery Tool (2026 Enterprise Edition)

Recover, repair, and restore corrupted, orphaned, and inaccessible Microsoft Outlook Offline Storage (.ost) files into clean Outlook PST format.

  • Recover Inaccessible & Damaged OST Files
  • No Exchange Server Connection Needed
  • Preview Recovered Emails & Attachments
  • Export to PST, EML, MSG and MBOX
  • Auto-Split Large PST Archives
  • Available for Windows

Free trial: 50 items per folder.

Buy Personal — $49
One-time payment Encrypted checkout No recurring fees
OST Recovery Tool (2026 Enterprise Edition) · Local Sandbox
Verified 64-Bit
Source File Valid
OST
Damaged_Offline.ost
Outlook Storage File (.pst)
Integrity: SHA-256 Passed
Local Engine
Export Formats 6 Formats
PST PST
EML
MSG
MBOX
PDF PDF
HTML
All Supported Formats →
✓ Folder Tree Intact
✓ Attachments Kept
✓ Zero Outlook DLLs
100% Offline Machine Processing View 6-Step Guide
Available for Windows 11 / 10 System requirements

OST Recovery Tool features

Find the capabilities that matter to your task, from supported formats to processing options.

Formats and mailbox content

  • Deep File Recovery Engine for Severely Corrupted or Inaccessible OST Files
  • Complete Recovery from Orphaned & Inaccessible OST Accounts
  • Recovers Hard-Deleted Emails, Contacts, and Calendar Entries
  • Direct Cloud Export to Microsoft 365 & Live Exchange Server
  • Full Mailbox Preview with Headers, HTML/RTF, and Attachments
  • Processes 150GB+ Giant OST Files with Zero Memory Leaks
  • Handles Corrupt Header CRC Mismatches and Exchange database engine Errors
  • Preserves Original Folder Structure and Message Properties
  • Built on Modern .NET 8 / C# Avalonia Native Architecture
  • Local processing on your computer

Filters and file organization

  • Configurable PST Auto-Splitting (2GB to 50GB)

System compatibility

  • Converts Recovered OST Data into Healthy Unicode PST Files

Need a closer look at a specific capability?

View all OST Recovery Tool features →

Supported formats and destinations

Check the input and output options for OST Recovery Tool. Review format-specific settings in the user guide before starting a full job.

Read the product guide →
Source files and accounts
  • OSTOutlook OST
Export formats and destinations
  • PSTOutlook PST
  • PDFAdobe PDF
  • MBOX Archive
  • EML
  • Outlook MSG
  • HTML
  • Microsoft 365
  • Live Exchange
Official Video Walkthrough

See OST Recovery Tool (2026 Enterprise Edition) in action

Watch our step-by-step walkthrough to verify offline mailbox parsing, real-time message previews, and zero-cloud conversion workflows before evaluating your own archives.

OST Recovery Tool (2026 Enterprise Edition) · Official Video Walkthrough (2:10)
1080p HD
OST Recovery Tool (2026 Enterprise Edition) video guide preview
Duration: 2 min 10 sec
100% Offline Engine
Standalone: Operates with zero cloud upload & no Outlook installation
Watch on YouTube

Video Chapters & Key Steps

Click to jump to time
Verified Local Execution Guarantee All demonstrations in this walkthrough reflect the authentic desktop engine. The free trial allows you to convert up to 50 items per folder with full attachment and hierarchy preservation.

Evaluate OST Recovery Tool before you buy

Use the free trial to check whether the result fits your task. Here is what to look for when testing your own data.

  1. Select damaged PST or OST archive

    Select your corrupted Outlook data file. The deep B-Tree sector carver analyzes folder hierarchies and recoverable items.

  2. Configure recovery & output targets

    Select destination format (rebuilt PST, EML, MSG, MBOX) and choose deleted item extraction options.

  3. Inspect recovered items & attachments

    Preview recovered emails, folder trees, and attachments before licensing. The evaluation edition lets you preview all items and export 50 items per folder.

System requirements

Check your computer before installing OST Recovery Tool. Allow additional storage for your source files and output.

Download the free evaluation →

Trial limit: 50 items per folder.

Windows
Windows 11 / 10 / 8.1 / 7 (64-bit & 32-bit), Windows Server 2016–2025
Processor
Intel Core i3 2.0 GHz or AMD equivalent
Memory
4 GB minimum (8 GB recommended for 50GB+ OST files)
Installation space
150 MB free disk space for installation
Additional requirements
No Microsoft Outlook or Exchange Server installation required

Choose your OST Recovery Tool (2026 Enterprise Edition) license

Transparent one-time pricing with dedicated multi-year updates & zero recurring fees.

Personal License

Ideal for individual users needing to repair or recover personal corrupted / orphaned Outlook OST files.

$49

1-Year License & Updates

One-time payment • Zero recurring fees

Buy Personal Key
  • 2 PCs / 2 Macs Workstation Activation
  • Repair up to 10 Corrupted PST / OST Files
  • Export to Rebuilt PST, EML, MSG, HTML & MBOX
  • Direct File-System Carving (No Outlook Required)
  • 1 Year Free Software Updates & Patches
  • Standard 24/7 Technical Support
Most Popular

Corporate License

Designed for IT administrators, computer repair shops, and enterprise helpdesks recovering company mailboxes.

$149

2-Year License & Updates

One-time payment • Zero recurring fees

Buy Corporate Key
  • 5 PCs / 5 Macs Workstation Activation
  • Repair up to 50 Corrupted PST / OST Files
  • Deleted Email Resurrection & B-Tree Carver
  • Commercial & Corporate Mailbox Recovery
  • 2 Years Free Software Updates & Patches
  • Priority 24/7 Technical Support

Enterprise License

Built for large corporate enterprises, forensic investigation labs, and managed IT service providers.

$299

3-Year License & Updates

One-time payment • Zero recurring fees

Buy Enterprise Key
  • 10 PCs / 10 Macs Workstation Activation
  • Repair up to 250 Corrupted Files & 50GB+ Archives
  • 8-Tab Forensic Hex & MAPI Inspection Engine
  • Commercial & MSP Client Servicing Rights
  • 3 Years Free Software Updates & Patches
  • Dedicated 24/7 VIP Support + Remote SLA
Compare all license specifications & capabilities in detailed matrix

OST Recovery Tool (2026 Enterprise Edition): frequently asked questions

All 5 technical & workflow FAQs
Can I recover data from an orphaned OST file if the original email account is deleted?

Yes. Prism OST Recovery Tool is specifically designed to open and extract all data from orphaned OST files even after the associated Exchange, Office 365, or IMAP account has been deleted or decommissioned.

Do I need Microsoft Outlook or Exchange Server installed?

No. The software features an independent low-level .NET 8 B-Tree parser that repairs and extracts OST files directly from disk without requiring Microsoft Outlook or Exchange Server.

Can the tool recover permanently deleted emails?

Yes. The deep physical sector scanner carves unallocated B-Tree database blocks to recover hard-deleted emails and items that were emptied from the Deleted Items folder.

What is the maximum OST file size supported?

Prism OST Recovery Tool reads large OST files in chunks instead of loading the whole file into memory. No maximum size is documented here; test your own file in the free trial.

What are the limitations of the free trial version?

The free evaluation version allows you to scan and preview all recovered items, with a conversion limit of 50 items per folder. Purchasing a license removes all limits.

Need more detail?

All features → Step-by-step guide → System requirements → Release notes → Ask a question →
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