Themes don't come as part of Excel 2010? When I click on the Themes drop-down I see 40 themes that are listed as Built-in, as well as another 17 listed from Office.com. Apparently, from searching the Web, I'm not the only person with this issue. If something is Built-in it means just that: it comes with the software. I just thought that someone here might know why they are not working.