If you find that you don’t use the Jump List functionality for Outlook 2010, you can minimize it to the System Tray to free up space on the Task Bar.
1. Close Outlook.
2. Go to the Shortcut that you use for opening Outlook (i.e. Start > All Programs > Microsoft Office or the one you pinned to your Start Menu).
3. Right-click the shortcut and select Properties from the resulting menu.
4. Select the Compatibility tab.
5. In the Compatibility mode section, check the Run this program in compatibility mode for: checkbox.
6. Use the now unghosted dropdown menu and select Windows Vista (Service Pack 2).
7. Click the OK button.
8. Open Outlook 2010 using the same shortcut.
9. Go to the System Tray and find the Outlook icon.
10. Right-click the icon and select Hide When Minimized.
Now when you minimize Outlook it will show in the System Tray and not the Task Bar.