Many difficulties are seen manually when converting the MBOX file to PST. This is why you can directly go to MBOX to PST Converter which you can convert single/multiple containing bulk MBOX files into PST format. I recommend ToolsBaer MBOX to PST Converter. This easy-to-use program maintains email properties and attachments while supporting batch conversion. It is completely compatible with every version of Windows OS and Outlook and works with a variety of MBOX email clients. Use the free trial version to give it a try.