Oops. Forgot the new files.

themes/seven/ie7.css

+
+ul.tabs.primary {
+  padding: 0;
+}
+ul.primary li,
+ul.primary li a,
+ul.primary li.active a {
+  float: none !important;
+  display: inline;
+}
+ul.primary li,
+ul.primary li a,
+ul.primary li a.active,
+ul.primary li a:active,
+ul.primary li a:visited,
+ul.primary li a:hover,
+ul.primary li.active a {
+  zoom: 1;
+  position: relative;
+}
+ul.admin-list li {
+  position: static;
+}