Figured I would make a post about the mailto for Hyena. I practically live inside of Hyena for most of my administration and wondered if I could find a custom tool to send an email to a user. This tool should work for any version of Outlook. You would just need to change the program path.
Email User
"C:\Program Files\Microsoft Office\Office12\Outlook.exe" /c ipm.note /m %E%
Email User
"C:\Program Files\Microsoft Office\Office12\Outlook.exe" /c ipm.note /m %E%