Convert, export, migrate, and backup Mac Outlook .olm archives to Windows Unicode .pst and 16 other formats.
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 OLM to PST Converter for Mac & Windows. Review format-specific settings in the user guide before starting a full job.
Read the product guide →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 OLM to PST Converter for Mac & Windows. Allow additional storage for your source files and output.
Download the free evaluation →Trial limit: 50 items per folder.
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Windows Outlook cannot open Mac OLM files directly. Prism OLM Converter reads the OLM file and writes a Unicode PST without requiring Microsoft Outlook on macOS or Windows. Guide steps
Yes. Prism OLM Converter is compiled as an Apple Silicon Universal Binary with dedicated ARM64 instructions for M1, M2, M3, and M4 chips. It executes overhead, taking full advantage of unified memory bandwidth for efficient local conversion.
The engine uses a streaming memory-safe iterator that parses emails item-by-item instead of buffering entire gigabyte archives into RAM. To protect Windows Outlook from legacy B-tree file corruptions, you can also toggle Auto-Split PST to divide the output into clean 2GB, 5GB, 10GB, or 20GB volumes.
Yes. The converter extracts all Contacts with full metadata (vCard format, contact photos, job titles, phone numbers, notes) and Calendar events (iCalendar ICS format with recurrence rules, meeting attendees, reminders). These are mapped straight into their corresponding Contacts and Calendar folders in the output PST.
Every converted email, contact, and calendar item is recorded in an embedded SQLite checkpoint ledger in real time. If a power outage, network drop, or accidental shutdown halts the process, relaunching the migration detects the checkpoint and resumes immediately from the exact failure point without duplicating emails.
Yes. You can bypass intermediate PST files entirely by selecting direct cloud ingestion. Authenticate via modern OAuth 2.0 PKCE for individual user accounts or leverage Microsoft Graph API and Google Workspace Admin SDK with P12 Service Account delegation for domain-wide enterprise tenant migrations.
The engine computes SHA-256 and MD5 cryptographic checksums across message bodies, headers, and attachments during the scan phase. When enabled, cross-file deduplication automatically identifies identical messages across multiple OLM backups and skips duplicates, preventing mailbox bloat in the target destination.
Yes. The 7-category data hygiene filter lets you target exact subsets of your data. You can filter by date ranges (presets or custom dates), include or exclude specific sender and recipient email addresses, apply regex subject patterns, filter attachment sizes, and selectively toggle Emails, Contacts, or Calendars.
