I attended Integrigy's CEO Stephen Kost's session on July 2007 CPU. One of the interesting things which Stephen explained was the CPU situation when you upgrade. Suppose you are current on your quarterly CPU and have applied July 2007 CPU. You are on 11.5.9 release and decide to upgrade to 220.127.116.11. Once you ugprade to 18.104.22.168, you'll have to apply all E-biz security patches starting from July 2005 - July 2007. 22.214.171.124 comes with April 2005 CPU pre-loaded.
This is because security patches are version dependant and if you had them on 11.5.9, it doesn't protect your 126.96.36.199 code.