Maybe this will help someone else as it did me.
I upgraded our Domino server from 6.5.5 to 7.0.2, then followed Tech Note 1219243 on how to upgrade the Resource Reservations DB to use the v7 template. The upgrade seemd to go over ok, but I ran into a few issues. Since half of our domain was still using 6.5.5 clients and the other was on 7.0.2 clients, the 6.5.5 clients were able to double book resources. Anyone using 7.0.2. clients seemed to work as designed. I ended up having to rebuild Busytime.nsf in order to correct this issue → http://www-1.ibm.com/support/docview.wss?rs=899&uid=swg21086471
Maybe this will help you.
Adam