I can't find anywhere to change the default email client?

Problem:

I can't find anywhere to change the default email client? I have Windows Live Mail set as my system default email client. When I try to send an email through RezStream it keeps popping up the configuration utility for Outlook 2010 (which is installed on the system, but not set up).

Solution:

In RezStream you will need to go to Tools>Configure>Functionality

Make sure the box for "Use Outlook to send email (If Outlook is installed on Machine)" is not checked and then exit the program and come back in.