The Sun Java System Connector for Microsoft Outlook can be installed only if Microsoft Outlook is set to be your default email client. If Outlook is not set as your default email client, the Setup Wizard will notify you of the problem (in an error message after the Welcome screen), and prompt you to acknowledge the notice and exit the program.
Open your Windows Control Panel. If you are running Windows XP (only): Select “Switch to Classic View.”
Double-click on Internet Options.
Select the Programs tab from the Internet Properties window.
Select Microsoft Outlook from the Email pull-down menu.
You may rerun the Setup Wizard after you set your default email client to Outlook.