If you’re having many programs pinned in taskbar, you might want to shift one or two applications from taskbar to system tray. Outlook 2010 offers a small handy option to always minimize the program to system tray. Let’s take a look a how to minimize Outlook to system tray.
To hide the Outlook window from taskbar when minimized, right-click Outlook in system tray and select Hide When Minimized.
It will instantly remove Outlook from taskbar, letting you to access it only from system tray.