If you have Internet mail files that include the mbox file extension, then you can import the file into your Microsoft Office Outlook 2007 application to manage the content of the file in the Outlook 2007 program. Once the process is complete, you can view the mbox file in your Inbox folder.
Open the Microsoft Outlook 2007 application on your computer. Click on the “Microsoft Office” button from the top toolbar menu.
Click on the “Import and Export” option and then the Import and Export Wizard dialogue box will pop up on your screen.
Click on the “Import Internet Mail and Addresses” option and then click on the “Next” button.
Click on the “Outlook Express” option from the list of applications and then click on the check box next to the “Import Mail” field.
Click on the “Finish” button and the mbox file will be imported into your Outlook 2007 application.