If you are looking to convert large OLM files to Thunderbird using Aryson OLM file Converter is efficient and straightforward. The software supports bulk conversion, allowing multiple OLM files to be processed at once, which saves significant time for large mailboxes. It preserves the original folder hierarchy, emails, contacts, calendars, tasks, notes, and attachments, ensuring zero data loss. Advanced features like selective conversion, date filters, duplicate removal, and preview of mailbox items optimize conversion speed and accuracy. The exact time depends on file size and system performance—smaller OLM files may take minutes, while very large mailboxes could take longer, but the tool handles high-volume data reliably without requiring Outlook installation. It is compatible with Windows 11/10/8/7 and Mac Outlook versions.

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