This is an example of a container that has a box-shadow. In IE, one can use the DropShadow filter as long as the container has a background-color or background-image (i.e. the object can not have a transparent background).
This is an example of a container that has a box shadow with a transparent color. In order to make this work in IE, one must not only apply the DropShadow filter, but also use the Chroma filter to erase a background color.