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Specifications

OST Converter Tool (2026 Enterprise Edition) — Technical Specs

System requirements, supported formats and trial limit for OST Converter Tool (2026 Enterprise Edition).

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System Hardware & OS Support Matrix

Operating System Windows 11, 10, 8.1, 8, 7 (64-bit) / macOS Sequoia, Sonoma, Ventura (Apple Silicon M1-M4 & Intel)
Processor / CPU Intel Core i3 / AMD Ryzen 3 / Apple M1 or higher
Memory (RAM) 4 GB minimum (8 GB recommended)
Disk Installation Space 200 MB free installation space

Deep Architecture Specifications

Source Database & Ingestion Engine

Supported Source Formats Offline Outlook Storage Table (.ost) from Outlook 2000, 2003, 2007, 2010, 2013, 2016, 2019, 2021 & Office 365
Orphaned File Compatibility Opens orphaned OST files without Exchange Server
Header & Block Repair Automatic B-tree index reconstruction, CRC repair, and unallocated sector carving for deleted items
Item Extraction Scope Emails, Attachments, Contacts (vCard), Calendars (ICS), Tasks, Notes, and Journal entries

Output & Archival Destinations

Mailbox Container Formats Unicode PST (64-bit with 2GB–50GB splitting), MBOX (RFC 4155), EML, MSG, EMLX
Legal & Forensic Formats Adobe PDF/A (ISO 19005-1 with Bates stamping & attachment embedding), HTML5, MHTML, RTF, CSV, JSON
Cloud Ingestion Destinations Direct push to Microsoft 365 / Office 365, Gmail, Google Workspace, and generic IMAP4rev1 servers
Contact & Calendar Standards vCard 4.0 (.vcf) and iCalendar 2.0 (.ics) with recurring event rules and attendee lists

Performance & Engine Telemetry

Resume Center Ledger ACID SQLite transactional state tracking for instantaneous pause and duplicate-free resume
Deduplication & Hygiene 7-parameter filtering: Date range, sender/recipient blacklist, subject regex, attachment size, SHA-256 deduplication

Security & Silent Deployment

Data Privacy Boundary Processing runs on your computer. Data goes only to the mail provider or cloud destination you choose.

Supported Source & Target Formats

Input Source Formats (2)

OST OST NST NST

Output Target Destinations (14)

PST PST MBOX EML MSG PDF PDF HTML MHTML W DOC TXT TXT JSON CSV CSV OFFICE 365 GMAIL IMAP

Free trial limit

50 items per folder

The free trial exports up to 50 items per folder so you can verify conversion fidelity before purchasing.

Download Free Trial

Test performance on your hardware with a 50-item preview export limit.

Download Trial Installer