Submit by email button

Hi everyone,
 
I've created a form in Livecycle designer and have inserted a "submit by email" button so that the form data can be sent by email. When I test the file by clicking the button, a dialogue box comes up with the following information:
 
Please indicate the option which best describes how you send mail.
1) Desktop Email Application
Choose this option if you currently use an email application such as Microsoft Outlook, Eudora, or Mail.
 
2) Internet Email
Choose this option if you currently use an internet email service such as Yahoo or Microsoft Hotmail. You will then need to save your form and return it manually to test [at] test [dot] com using your internet email service.
 
I chose the first option, ie. Desktop Email Application, but after clicking OK my email application didn't open at all. I'm currently testing on a Mac computer and I have Microsoft Outlook for Mac installed. Does anyone know why this has happened? It works when I test on a PC, ie. Outlook for Window opens up successfully.
 
Also, if the user needs to choose option 2, ie. Internet Email, how will they be able to save the form data and email it manually if this form has not had any usage rights applied? We've chosen not to apply usage rights as this would limit the number of users being able to return the form. Instead we chose to just have people email back the form data file, but if they can't save the full form, how can they access the data file in order to email it back?
 
Appreciate any help.