My friend's Diamond status lapsed this year due to a change in work environment which cut down his travel schedule. He has one DIAMGC (suite upgrade) certificate left over expiring 31 May 2005. As a Platinum member, can he still use the certificate? It doesn't say anywhere on the certificate that the user my be a Diamond GP member (or this is "understood"). If my friend can't use it, I guess he can let me use it; I'm a Diamond member. However, the certificate says "not transferable", but how do they track these things?