Can't send email from inside Word, Excel, or Powerpoint since ML upgrade

I have a 2010 Macbook Pro and recently upgraded from Lion to Mountain Lion. Since the upgrade, I can't send emails from within Word, Excel, or Powerpoint. Outlook itself works fine. I looked in Outlook Preferences and the box "Make Outlook the default application for e-mail, contacts, and calendar" is checked. This was working fine until the upgrade. Thank you.