For the sake of legacy and upgrade purposes, page layouts in SharePoint Server 2010 that were previously available in SharePoint Server 2007, such as the ArticleLeft.aspx page layout, include a new server-side
UIVersionContent controls identify two different versions:
• Version 3 corresponds to SharePoint Server 2007.
• Version 4 corresponds to SharePoint Server 2010.
Each control instance includes a
ContentTemplate control that includes markup that is used based on the version detected. For instance, in the ArticleLeft.aspx page layout, if version 3 content is detected, then SharePoint uses the style sheets enclosed in the