Yes, you can
import multiple MSG files into Thunderbird at once. While Thunderbird doesn't support MSG files directly, using a tool
MSOutlookHelp MSG Converter Tool makes bulk conversion easy. This tool allows you to select multiple MSG files or entire folders for conversion to Thunderbird-compatible formats, such as EML or MBOX. You can migrate large volumes of emails efficiently without losing any formatting, attachments, or folder structure. This method saves time compared to manual conversion, where each file would need to be processed individually. The tool ensures a smooth, error-free transfer of multiple MSG files into Thunderbird.