Mbx extension is related to Outlook Express Mailbox. You have chance to open mbx files with Microsoft Outlook Express.
Mbx extension stands for database files or email box which found in Outlook Express software. In the file, there may be old and sent mails. You have chance to open and read this file with Outlook by copying it to proper folder.
There are two softwares that open mbx files directly in the following links.
What to use mbx
Microsoft Outlook Express or free alternative softwares
which page related to mbx file
mbx Related Searches
You can check related links about mbx fileextension.