Todays millions of people depend on Outlook for managing emails and several other things. But sometime user of Outlook have to face inconvenience because of some error code or message. There are several type of error message can occur if you not use the Outlook properly and error 0x80042109 is one of them. These type of error message occur due to ignorance of software conflict, Outlook alert message and other reasons. Usually you may face this error message when you try to send email. If this error is not solved within time then it can cause PST corruption which lead to data loss.