OST to PST Converter

About This Tool

This converter targets IT administrators, helpdesk staff, and individual Outlook users who need access to mailbox data from OST files without an Exchange connection. It addresses device migrations, offline access, and OST corruption by producing a portable PST archive that can be imported into Outlook or migrated with standard tooling. The workflow is designed for reliability and auditability, enabling teams to preserve data continuity during transitions.
Conceptually, the tool reads the OST, enumerates mailboxes and folders, and reconstructs a matching PST structure. It transfers messages, calendar events, tasks, contacts, and attachments while preserving original item metadata such as dates and flags. The process creates a new PST without modifying the source OST, ensuring data integrity and compliance for backup and archival use cases.
Key differentiators include no requirement for a full Outlook installation on the conversion host, support for large OST files, and options to selectively migrate content (e.g., include calendars or exclude notes). It uses recovery-oriented heuristics to handle damaged items and can batch multiple OSTs into a single PST library. Outputs are standard PSTs compatible with mainstream Outlook clients.
Typical use cases cover platform upgrades, mailbox consolidation, offline access for field teams, and routine backups. The workflow involves uploading OST, selecting scope, running conversion, and downloading the PST. After download, IT or users import the PST into Outlook to validate data integrity and conclude the migration or archival process.

Sign in to see all your usage