Outlook stuck when mouse moves over the Printer icon

When the mouse moves over the Printer icon in Outlook while composing/replying to an email, outlook hangs and will not allow you to close or minimize the email or go back to the main window. This is because the tooltip associated with the Printer icon tries to see what the default printer is, and can cause it to hang if it's a network printer. You can turn off tooltips -

A permanent resolution for this behavior is to disable ToolTips for buttons. To do this, follow these steps:

1. On the View menu, point to Toolbars, and then click Customize.
2. On the Options tab, click to clear the Show ScreenTips on Toolbars check box.
3. Click Close.

This is courtesy of microsoft.com documented at -
http://support.microsoft.com/kb/245635