Most agents in the Policy Agent 2.2 software set are backward compatible with Access Manager 6.3 Patch 1 or greater. For compatibility information specific to Policy Agent 2.2 for Microsoft IIS 6.0, see Compatibility of Agent for Microsoft IIS 6.0 With Access Manager.
Policy Agent 2.2 is only compatible with Access Manager 6.3 when the Access Manager patch has been applied.
Be aware that Policy Agent 2.2 takes advantage of certain features that exist in Access Manager 7 that do not exist in Access Manager 6.3, such as “composite advices,” “policy-based response attributes,” and others.