Where are the OCS 2007 Settings Stored in AD?

I find myself having to look this up ever-so-often, so I thought I would document it once and for all.

OCS stores key information in AD (everything from Global Settings, Location Profiles, Phone Routes, Policies, Pool Information, Trusted MCU’s and Trusted Services).

By default, in OCS 2007, the settings are stored in the root domain System Container. [...]