Export Outlook PST files to multiple formats — PDF, MBOX, EML, Gmail, Office 365, IMAP — without needing Microsoft Outlook installed.
Free trial: 50 items per folder.
Find the capabilities that matter to your task, from supported formats to processing options.
Check the input and output options for PST Converter Tool. Review format-specific settings in the user guide before starting a full job.
Read the product guide →Clear expectations before you begin. Here is what PST Converter Tool converts across your mailbox items, and what remains client-side.
| Mailbox item type | Supported data & attributes | Destination formats | Known limitations & exclusions |
|---|---|---|---|
| Email messages | Message body (HTML, RTF, Plain text), Subject, From, To, CC, BCC, Sent/Received dates, Message-ID, Read/Unread flags | PDF, MBOX, EML, MSG, HTML, M365, Gmail, IMAP | Unreadable sectors in severely corrupted source archives are skipped without halting batch processing |
| Attachments & media | Original binary files (PDFs, Office docs, images, ZIPs), inline CID images, embedded message objects | Preserved inside EML/MSG/MBOX; embedded or extracted in PDF/HTML | Encrypted attachments require original credentials to view after export |
| Contacts & address books | Full names, email addresses, phone numbers, job titles, companies, physical addresses, notes | vCard (.vcf), CSV, Microsoft 365, Google Workspace | Outlook distribution list memberships are mapped to individual contact records |
| Calendar events | Meeting subject, start/end timestamps, location, attendee lists, meeting notes, recurrence rules | iCalendar (.ics), Microsoft 365, Google Calendar | Past meeting tracking responses remain client-rendered |
| Client rules & views | Folder tree structure (Inbox, Sent, Archive, custom subfolders) | Recreated in destination container | Local Outlook search folders, custom ribbon views, and local VBA macros are not transferred |
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.
Use the free trial to check whether the result fits your task. Here is what to look for when testing your own data.
Choose a file containing folders, attachments, and character encodings typical of your mailbox. Keep your source file safe.
Select your desired export format (PDF, MBOX, or cloud migration) and set split thresholds if partitioning large archives.
Open the exported files in your target email client or document reader. The free evaluation converts 50 items per folder to verify fidelity.
Check your computer before installing PST Converter Tool. Allow additional storage for your source files and output.
Download the free evaluation →Trial limit: 50 items per folder.
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Yes. Outlook, Exchange and Office do not need to be installed. Prism reads raw binary blocks directly off disk using an internal 64-bit engine that processes files directly without requiring Outlook.
When an oversized archive experiences corruption or the built-in Inbox Repair Tool (ScanPST) encounters difficulty repairing severely damaged block tables in place, Prism provides a non-destructive alternative. Prism operates in strict read-only mode on your original source file, reading readable node allocations directly and streaming undamaged messages into fresh destination files without altering the source archive.
The free trial lets you load any PST, inspect the entire folder hierarchy, and preview rich HTML email bodies along with full RFC headers and attachments. You can export up to 50 items per folder to check the result before you buy.
Yes. The engine reconstructs your folder hierarchy while extracting document attachments in their original format, preserving inline images, and retaining standard RFC email headers (From, To, CC, BCC, Date, Subject, Message-ID). You can verify folder hierarchy and formatting in your own sample files using the free 50-item evaluation.
Yes. In addition to emails, Prism extracts Contacts (to vCard or CSV) and Calendar appointments (to standard iCal/ICS format), and can synchronize them to supported cloud destinations such as Google Workspace and Microsoft 365. Note that Outlook-specific personal views or local client rules remain client-specific and are not converted.
Yes. It is tailor-made for legal teams and compliance audits. In Step 4, choose PDF to produce ISO 19005-1 compliant PDF/A records with sequential Bates stamping (such as CASE-0001), custom header/footer coordinates, and original attachments embedded directly inside the document.
Yes. You will not need complex Azure AzCopy command lines, PowerShell scripts, or network upload SAS URLs. Administrators authenticate once using Microsoft 365 Graph API delegated access, load all corporate PST files into our User Mapping table, and let the engine import PST to Office 365 directly into target cloud mailboxes.
You won't lose a thing. Prism has a built-in SQLite Checkpoint Resume Center. Every converted item gets cryptographically logged. If your laptop sleeps or your Wi-Fi resets, just reopen the app and hit "Resume"—it picks up right from message #41,209 without creating duplicate records.
