There is an Outlook installed but when sending email via MYOB, I got an error "There is no email program associated to perform the requested action".

The reason for this is because I had Outlook 64-bit installed. When I bought an ASUS laptop with Office 365 installed, I just run Outlook, it asked for serial number so I punched it in and installed the necessary software. To fix this, uninstall Office 365 then install MS Office Home and Business 2016 32-bit.

MYOB only works for Outlook 32-bit.