2.2.1.48 PidNameContentClass Property
Type: PtypString ([MS-OXCDATA] section 2.11.1)
The PidNameContentClass property ([MS-OXPROPS] section 2.413) contains a string that identifies the type of content of a Message object. The value of this property is as follows:
For an E-mail object, the value is as specified in [MS-OXCMAIL] section 2.2.3.2.15.
For other Message objects, the value is as specified in the technical document that defines the particular Message object.
For the Web Distributed Authoring and Versioning Protocol (WebDAV), the value is as specified in the technical document that specifies the particular WebDAV extension.