Free PST Viewer is a professional email migration tool that lets you import emails, calendars, contacts, and attachments from 200+ sources (including PST files, Gmail, Exchange, IMAP servers, and more) directly into Microsoft 365 (Office 365) mailboxes — with zero data loss.
The Free Trial allows migration of up to 25 items per folder so you can evaluate the software without commitment. The Full version (starting at $39) removes all limits — migrate unlimited emails, calendar events, contacts, attachments, and folders across unlimited migration jobs.
Free PST Viewer is available for Windows (7, 8, 8.1, 10, 11 — both 32-bit and 64-bit) and macOS (11 Big Sur and later, including Apple Silicon M1/M2/M3 chips).
No. Free PST Viewer features a step-by-step guided wizard that walks you through every stage of the migration. Most users complete their first migration in under 10 minutes with no prior experience needed.
Migration
You can import from 200+ sources including: PST files, Gmail, Google Workspace, Microsoft Exchange (2003–2019), IMAP servers, Yahoo Mail, Outlook.com, Mozilla Thunderbird (MBOX), Apple Mail, Lotus Notes (NSF), Zoho Mail, ProtonMail, and many more.
Free PST Viewer migrates: Emails (with attachments), Calendar events and recurring appointments, Contacts (with photos), Tasks, Notes, Folder structure and subfolders, Email flags and categories, and Read/unread status. You can choose which categories to migrate per job.
The incremental migration engine automatically checkpoints your progress. If interrupted by a network issue, power outage, or system restart, simply re-run the job. Already-migrated items are detected and skipped — you continue from exactly where you left off.
Speed depends on data volume and your internet connection. As a benchmark: a 10 GB PST file migrates in approximately 15–30 minutes on standard broadband. A 100 GB Exchange mailbox typically takes 2–4 hours. The tool displays a real-time ETA throughout the process.
Yes. The Enterprise License supports bulk migration via CSV upload. Map source accounts to their corresponding Office 365 destination mailboxes in bulk and process them all in a single run — ideal for organization-wide migrations of hundreds of mailboxes.
Yes — 100%. Free PST Viewer faithfully reconstructs your entire folder hierarchy, including custom folders, subfolders, nested categories, and special folders like Sent, Drafts, and Deleted Items. No flattening or restructuring occurs.
Security & Privacy
Absolutely. Free PST Viewer processes all data locally on your machine — your emails, credentials, and attachments never pass through our servers. Communication with Microsoft 365 uses OAuth 2.0 authentication and TLS-encrypted HTTPS connections. You retain full control at all times.
No. Passwords are never stored. For Microsoft 365, we use OAuth 2.0 token-based authentication — you authorize through Microsoft's own login page and we receive a temporary access token. For other sources, credentials are used only during the active migration session.
Yes. Because all processing is done locally on your infrastructure, Free PST Viewer is compatible with GDPR, HIPAA, and SOC 2 compliance requirements. Your organization retains full data sovereignty throughout the migration process.
Licensing & Pricing
All licenses are a one-time purchase with lifetime validity. You pay once and own the software forever. Free updates are included for 1 year from purchase. After the first year, the software continues working — you simply won't receive new feature updates unless you renew.
Yes — we offer a full 30-day money-back guarantee, no questions asked. If the software doesn't meet your needs for any reason, contact our support team and you'll receive a full refund within 3–5 business days.
Product delivery is fully automated. Within minutes of payment confirmation, you'll receive an email containing both the download link and your unique activation key. The activation process takes under 30 seconds.
Absolutely. You can upgrade from Standard to Business or Enterprise at any time by paying only the price difference. Contact our support team to request an upgrade and we'll issue a new license promptly.
Technical
Free PST Viewer supports all Microsoft 365 plans that provide mailbox access, including: Microsoft 365 Business Basic/Standard/Premium, Microsoft 365 Apps, Exchange Online (Plan 1 & 2), Office 365 E1/E3/E5, and Microsoft 365 Education and Government plans.
For migrating your own personal mailbox, you only need regular user credentials. For migrating multiple users or accessing admin-level mailboxes (including shared mailboxes), you'll need Microsoft 365 Global Admin or Exchange Admin credentials.
Free PST Viewer supports PST files from all versions of Microsoft Outlook, from Outlook 97/98 (ANSI format) through Outlook 2021/365 (Unicode format). Both 32-bit and 64-bit PST files are fully supported with no size limitations.
Errors are logged in detail in the migration report (accessible from the tool dashboard). Most common errors are connection-related and resolve on retry. For persistent issues, our technical support team (available 24/7 via live chat) can review your error log and guide you through resolution.
Still Have Questions?
Our support engineers are happy to help. Average response time under 4 hours.