2.2.2.2 PidTagJunkIncludeContacts Property
Type: PtypInteger32 ([MS-OXCDATA] section 2.11.1)
The PidTagJunkIncludeContacts property ([MS-OXPROPS] section 2.759) indicates whether e-mail messages from contacts can be treated as junk.
If this property is set to 1, the Junk Email rule MUST specify conditions such that e-mail messages from contacts are never treated as junk. If this property is set to 0 (zero), the Junk Email rule MUST specify conditions such that e-mail messages from contacts can be treated as junk. The conditions of the Junk Email rule are specified in the PidTagExtendedRuleMessageCondition property ([MS-OXORULE] section 2.2.4.1.10). For details about creating the Junk Email rule, see section 3.1.4.1.