I'd recommend the eSoftTools PST to MBOX Converter Software if you're looking for basic information. "How can I export Outlook emails to MBOX?" Isn't it true that its production consists of rapid, steady steps? Before running the converter, it offers a live preview of the PST file elements. Technical support is available 24 hours a day, seven days a week. Both customers have equal access to the same content. All buyers have access to a demo version. You can convert 25 emails per folder for free in the sample version.
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