How do I create a button to initiate an email from Outlook?

that's a good one, but it doesn't help me with the error i'm getting in the QB formula button.

even when i type:
MailTo:name@domain.com?cc=othername@domain.com?subject=subjectline
in the browser it generates an email that looks like this:

To... name@domain.com
Cc... othername@domain.com?subject=subjectline


i must be missing something between the "othername@domain.com" and the "?subject=..." pieces.