OpenSSO Enterprise supports both Policy Agent 3.0 and Policy Agent 2.2 in the same deployment.
Be aware that while Policy Agent 3.0 and Policy Agent 2.2 can exist in the same deployment, they cannot exist on the same container.
However, agents in the 2.2 release only have the option to store their configuration data locally in the AMAgent.properties file. Therefore, the OpenSSO Enterprise centralized agent configuration option is not supported. To configure an agent in the Policy Agent 2.2 release, you must edit the AMAgent.properties file.
For more information about Policy Agent 2.2, see the documentation collection: http://docs.sun.com/coll/1322.1