NOVELTY - A curable organopolysiloxane composition comprises component (A) comprising organopolysiloxane (a1) having alkoxysilyl-containing group (I) and/or at least 0.5 alkenyl groups (a2) on average, and an organopolysiloxane (a2) having 2 or more alkenyl groups per molecule, and does not have alkoxysilyl-containing group (in the mixed substance, the content of component (a1) is at least 10 mass%, but less than 100 mass%), and organopolysiloxane (B) having 2 or more silicon-atom-bonded hydrogen atoms per molecule, a hydrosilylation catalyst (C) and a condensation reaction catalyst (D).    USE - Curable organopolysiloxane composition is used for protective agent/adhesive composition for sealing electric/electronic device (all claimed). Uses include but are not limited to electric power generation system, space transportation system, engine control in power train system, air-conditioner control, servomotor control, machine tool, elevator, electric vehicle, hybrid car, and fuel cell power generation etc.    ADVANTAGE - The curable organopolysiloxane composition has excellent initial stage adhesiveness with respect to resin, and adhesiveness with respect to base material, when cured, and hardens easily by heating at temperature of (-50) degrees C or less. The electric/electronic device sealed using the curable organopolysiloxane composition has excellent durability, and reliability for a long period of time.    DETAILED DESCRIPTION - A curable organopolysiloxane composition comprises component (A) comprising organopolysiloxane (a1) having alkoxysilyl-containing group of formula (I) and/or at least 0.5 alkenyl groups (a2) on average, and an organopolysiloxane (a2) having 2 or more alkenyl groups per molecule, and does not have alkoxysilyl-containing group (in the mixed substance, the content of component (a1) is at least 10 mass%, but less than 100 mass%), and organopolysiloxane (B) having 2 or more silicon-atom-bonded hydrogen atoms per molecule, a hydrosilylation catalyst (C) and a condensation reaction catalyst (D). The content of component (a1) is 10-100 %mass with respect to 100 %mass of mixture. The content of silicon atom-bonded hydrogen atoms in the component (B) with respect to one alkenyl group in (A) component is 0.3-20.    R1=monovalent hydrocarbyl which does not have aliphatic unsaturated bond;    R2=alkyl;    R3=alkylene;    a=0-2;    b=3-a; and    p=1-50.    An INDEPENDENT CLAIM is included for protective agent/adhesive composition, which consists of curable organopolysiloxane composition.