2.2.4.1.6 PidTagRuleMessageLevel Property
Type: PtypInteger32 ([MS-OXCDATA] section 2.11.1)
The PidTagRuleMessageLevel property ([MS-OXPROPS] section 2.953) SHOULD be set on the FAI message. This property has the same semantics as the PidTagRuleLevel property (section 2.2.1.3.1.6).