Go to Control Panel > Default Programs > Set your default programs > Outlook > Choose defaults for this program.  Look for the MAILTO option in the "Protocols" section and the "Send mail" option in the MAPI section.  They are probably unticked and show Pegasus Mail.  Tick them to make Outlook the default program for those actions.

Outlook is my default e-mail client because our company uses Microsoft Exchange Servers for our business e-mail.  I installed Pegasus solely for my personal e-mail but found when I click an email address in our CRM it defaults to Pegasus instead of Outlook.  Outlook is still checked as the default e-mail client but I can't find where to prevent Pegasus from automatically opening for a new e-mail.

Help or I will have to remove it.

thanks.