After trying out Mozilla's Thunderbird application I quickly realized that outlook is a much better and more realiable application for doing business. Here I'll compile a list of Plugins that will help you stay connected and more organize.

Skype Toolbar

Call to talk through an email in one click from your inbox with the Skype Toolbar for MS Outlook®.
Simply click on a Skype Name, phone number or Skype button in the email message or signature to start a call or an instant message. No swapping between programs or dialling required

Linkedin Outlook Toolbar