Outlook does not provide a straightforward native option to directly import an MBOX file because it primarily works with formats such as PST and OST. A common approach is to first convert the MBOX data into PST and then open or import the resulting PST in Outlook. The conversion method you choose may depend on the size of the mailbox and whether you need to preserve folders and attachments. SysTools MBOX to PST Converter can be considered for converting MBOX data into Outlook-compatible PST format before moving it into Outlook.