Windows users can find the MBOX Converter application. I suggest the TrustVare MBOX Converter Software is the best solution provided. Users can convert the MBOX Mailbox files into multiple file formats, such as PST, MSG, EML, EMLX, PDF, HTML, MHTML, etc. This tool also converts the MBOX file into an Office 365 account. You can directly import the Thunderbird Mailbox database file. Supports all Windows OS versions.