Specifications
OST to PST Converter Tool — Technical Specs
System requirements, supported formats and trial limit for OST to PST Converter Tool.
System Hardware & OS Support Matrix
Operating System Windows 11, Windows 10, Windows 8.1, Windows 8, Windows 7 (64-bit & 32-bit); Windows Server 2022, 2019, 2016
Processor / CPU 1 GHz Intel/AMD processor (Multi-core 2.0 GHz or higher recommended for 50GB+ files)
Memory (RAM) 4 GB RAM minimum (8 GB RAM recommended for multi-threaded batch conversion)
Disk Installation Space 500 MB free hard drive space for installation; additional space for destination PST files
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
NST
Output Target Destinations (1)
PST
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