To import OLM files into Thunderbird on Windows, you first need to convert the OLM file into a Thunderbird-compatible format, since Thunderbird cannot read OLM directly. The most efficient way is to use a dedicated converter like Aryson OLM Converter. After installing the tool, open it and add your OLM file using the “Open” button. The software allows you to preview the complete mailbox structure and select specific folders or items for conversion. Choose MBOX as the output format because Thunderbird supports MBOX files. You can also apply advanced options such as date filters, duplicate removal, or excluding attachments. Once you select the destination folder and start the conversion, the tool will generate an MBOX file. Finally, open Thunderbird and use the Import feature to load the converted MBOX file, bringing all your emails and folders into Thunderbird without data loss.

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