<A target="_blank" href="http://www.thenewdominoadmin.com/blog/?p=1225&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+TheNewDominoAdmin+%28The+New+Domino+Admin%29">Marc Champoux was upgrading some Notes clients when he got the following error message</A>: Cannot upgrade AllClient installation to Notes client. The upgrade you are attempting is not supported. He not only figured out what the error meant and how to fix it. He's posted a LotusScript button you can use.