2.2.2.19 YesNoProperty
The YesNoProperty represents a Boolean value. For historical reasons, this type is used instead of BooleanProperty (section 2.2.2.9) for certain properties.
Simple type: eDT_LPWSTR
Validity: MUST be one of the following values: "Y" (for true) or "N" (for false).
Server validation: Servers MUST enforce validity constraints.
Client validation: Clients MUST enforce validity constraints.