I too encountered the same problem when I was outstation and wanted to open the MBOX File immediately. The easiest solution I found was SysInfo MBOX Viewer. It is a free MBOX viewer tool and is awesome. As it not only opens healthy files but also those that are corrupt. MBOX is supported by many email clients such as Mozilla Thunderbird, Eudora, Apple Mail, Mulberry, OperaMail, etc. You can view Inbox, Outbox, Drafts, etc including the attachments on the tool.
Special feature: The tool provides the preview option to check the files beforehand.
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