How to display an unordered list in two columns?

With the following HTML, what is the easiest method to display the list as two columns?

<ul>
    <li>A</li>
    <li>B</li>
    <li>C</li>
    <li>D</li>
    <li>E</li>
</ul>

Desired display:

A B
C D
E

The solution needs to work with Internet Explorer.