Our primary goal is to help you stay ahead of the technology curve. This is why we are often adding new skins (we now have 23!) so that your web sites and apps look trendy. The thing is, we can no longer support such a large number of skins and if we want to continue adding new, more modern skins, we need to stop the support for some old and not that popular ones: Forest, Hay, Simple, Sunset, Sitefinity and Transparent. Read more about how the transition will happen.