A while ago, a friend told me that he would like to upgrade his SPS 2003 to MOSS 2007. He tried upgrading, but was unable to get his custom 2003 list in 2007. Looking deeper, we discovered that when he created the list, he made sure to copy an existing list definition before modifying it (good for him!), but he took a little shortcut, and added the custom list definition to an existing site definition. This was causing him the headache now, as he was upgrading to 2007 … so we played with it for a...