AppleMail, Eudora, Spicebird, etc. uses MBOX file format for saving the email data.These MBOX files are not directly accessible in MS Outlook and need to be converted from MBOX to Outlook PST file format. So, it is highly recommended to use a third-party MBOX to Outlook PST tool like Kernel for MBOX to PST to access MBOX file data in Outlook.