The Sphere email function will create an email from your default email program.  So, for example, following these steps will open a new Outlook mailing, or whatever program is set up as the default program on your system.  There is not a capacity to send the email through the Contact record itself in Sphere.

1. Go to Contacts > Individuals
2. Search for the contact
3. Click on on the Manage link
4. To send an email click the Email Address listed on the record