Flagship Utility
Email MigrationOST to PST Converter
Convert disconnected, orphaned, or oversized Outlook OST cache files into healthy Unicode PST archives.
- 50GB+ Mailbox Support
- Zero Exchange Dependency
- PST, EML, MSG & MBOX Output
We Empower•Windows 11 & 10 Certified Repair Suite
24/7 Human Engineers: Response in < 15 mins
WindowsUtils Solutions Repair & Safeguard
Your Windows PC & Outlook Data.
Supercharge, recover, and repair your Windows PC with ultimate precision. Independent desktop software solutions engineered for Outlook OST to PST repair, oversized mailbox recovery, MBOX to PDF export, and cloud backups. 100% offline Windows 11 & 10 local execution with zero cloud exposure.
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4.9/5
Over 2,000,000+ Happy Windows Users
100% Virus-Free
Zero Data Loss
100% Offline Local
OST to PST Converter & Repair
Email & Repair
Extract and repair emails, attachments, calendars, and address books from orphaned or corrupted Outlook .ost files directly into healthy, importable .pst archives.
Up to 50 GB+
Mailbox Size
2007–2024 / 365
Outlook Support
100% Local Offline
Processing
Ready for Win 11 & 10Repair & Convert OST
Specialized Desktop Software Suite
Engineered for High-Volume Data Integrity
Dedicated desktop software utilities designed for email administrators, legal eDiscovery teams, and forensic analysts who require zero downtime and verifiable cryptographic accuracy.
100% Free
Data RecoveryFree PST Viewer
Inspect, read, and audit Outlook PST message stores without installing Microsoft Outlook or Office.
- No MS Office Needed
- Attachment Previews
- MAPI Metadata Inspector
Legal eDiscovery
Legal & PDFMBox to PDF Converter
Transform Thunderbird, Apple Mail, and Takeout MBOX files into searchable PDF documents with embedded attachments.
- Bates Stamping Built-in
- Embedded Attachments
- PDF/A Standard Compliant
Automated Archival
Cloud BackupIMAP Backup Software
Download complete mailboxes from any IMAP-enabled email provider directly to secure local storage.
- Incremental Delta Sync
- Multi-Format Export
- PowerShell Scriptable
Courtroom Standard
Legal & PDFPDF Bates Numbering
Stamp legal identification numbers, confidential prefixes, and page indices across millions of PDF pages.
- 6 Precise Page Positions
- OCR Layer Preservation
- Batch Directory Processing
Maintenance Utility
Data RecoveryPST File Splitter
Split oversized Outlook PST files by size, date range, year, or folder to prevent database corruption.
- Prevents 50GB Outlook Crash
- Splits by Year/Date/Size
- Zero Data Loss Guarantee
Core Engineering Principles & Human Pledge
Technology Built with Heart & Human Integrity
We believe software should treat you with respect: zero telemetry spying, no forced recurring subscriptions, and real human specialists ready to support you when you need it.
100% Offline Local Processing
Human Right to Data PrivacyYour Personal Data Never Leaves Your PC
We never upload your personal emails, confidential archives, or client records to external cloud servers. Everything executes 100% locally in your computer's RAM with zero tracking, zero telemetry, and complete peace of mind.
0 bytesever uploaded to external servers
Zero Freezing or Data Drops
Reliable When It Matters MostSmooth & Stable on 50GB+ Massive Mailboxes
Engineered with high-performance 64-bit streaming that handles severely damaged and massive Outlook files without freezing, running out of RAM, or dropping your precious correspondence.
50 GB+tested single-file capacity without crashing
No Monthly Fees & No Lock-In
Honest Lifetime OwnershipBuy Once, Keep Forever. Zero Forced Subscriptions.
We respect your wallet and despise recurring subscription traps. When you purchase a WindowsUtils license, you own it permanently. Free minor updates, lifetime usage, and zero surprise charges.
100%perpetual ownership guarantee
24/7 Live Assistance Available
Compassionate Technical CareReal Systems Engineers, Never Frustrating Chatbots
When valuable data is on the line, you need real answers from real specialists. Our dedicated team of Windows and Outlook engineers provides direct, patient guidance to help you recover your files.
< 15 minaverage human engineer response time
2M+
Users Helped Worldwide
140+
Countries Trusting Us
4.9
From 12,000+ Reviews
< 15 min
Average Human Reply Time
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Need help repairing a corrupted file or choosing the right tool?
Our systems engineers are online 24/7 to provide personal assistance.
Frequently Asked Questions
Clear Answers to Common Questions
Everything you need to know about offline security, file compatibility, and perpetual licensing.
No. Never. All WindowsUtils tools are standalone Windows desktop applications that execute 100% locally on your computer. Your files, passwords, attachments, and metadata never leave your local machine or traverse external servers.
Have a custom or technical deployment question? Contact engineering support
Risk-Free Evaluation
Ready to Simplify Your Windows Data Operations?
Download a free evaluation copy to scan and preview your files in under two minutes, or consult with our solutions desk for volume licensing and statement of work quotes.
30-Day Money-Back Guarantee·Instant Digital Key Delivery·256-Bit Encrypted Checkout
Representative Enterprise Scenarios
These documented operational scenarios and volume benchmarks illustrate typical migration, archival, and courtroom discovery workflows powered by WindowsUtils software engines.
Large-Scale On-Prem Exchange to M365 Cutover
Challenge: A commercial bank decommissioning on-premises Exchange servers encountered recurring timeouts when extracting 60GB executive mailboxes with third-party cloud tools.
Deployment: WindowsUtils OST to PST Converter parsed orphaned OST stores directly on air-gapped technician workstations, generating split Unicode PST archives with intact MAPI timestamps.
High-Volume Courtroom eDiscovery Bates Stamping
Challenge: A corporate litigation firm required defensible, court-admissible Bates stamping across millions of discovery pages without exposing privileged documents to web tools.
Deployment: PDF Bates Numbering Suite executed locally on isolated workstations, applying custom prefix numbering and cryptographic checksums while preserving underlying searchable text.
Air-Gapped Clinical Network Communications Archival
Challenge: A regional hospital group required periodic offsite archival of critical departmental mailboxes under strict HIPAA zero-cloud-transmission mandates.
Deployment: IMAP Backup Software was scheduled via local PowerShell tasks to archive departmental mailboxes directly onto encrypted, offline network-attached storage.
Automated Endpoint Mailbox Splitting Across 8,000 PCs
Challenge: Corporate laptops frequently crashed due to Outlook's 50GB file cap, creating high IT ticket volumes and database lockups for remote workers.
Deployment: PST File Splitter MSI package was deployed silently across endpoints via Microsoft Intune, automatically segmenting oversized archives by year.