Yes, you can convert OLM files to MBOX without installing Outlook for Mac. A dedicated OLM converter such as SysInfo OLM Converter can read OLM files independently and export their mailbox data directly into MBOX format.
To do this, launch the software on your Windows system, click Select Files or Select Folder, and add the required OLM files. Preview the mailbox contents, select the emails or folders you want to convert, and choose MBOX from the available saving options. You can then select the destination location and start the conversion.
The tool can preserve important mailbox information, including email content, attachments, and folder structure. It also supports converting multiple OLM files in bulk, making it useful when handling large mailboxes. Additional options such as date-based filtering, duplicate removal, and attachment management can help customize the conversion.