Upgrading a SharePoint farm can reveal hidden issues that may not be causing any visible consequences in your current environment. This was especially the case in a recent customer visit to assist with an upgrade from SharePoint 2007 to SharePoint 2010. During the upgrade we encountered the error “Failed to create field: Field type <field name> is not installed properly” while attempting to upgrade hundreds of SharePoint lists and document libraries. The issue my customer faced related to a ......