Mailout MSO 2008-01, Compliance Assistance & Certification Workshop Mailout MSO 2008-01, Compliance Assistance & Certification Workshop For HMC, OHRV, SORE & Equipment. Workshop held at CARB on February 20, 2008.Mailout MSO 2008-01, Compliance Assistance & Certification Workshop For highway motorcycles (HMC), off-highway recreational vehicles (OHRV), small off-road engines < 19 kW (SORE) & SORE Equipment.