0000950123-06-013864 S-8 4 20061109 20061109 20061109 COMMVAULT SYSTEMS INC 0001169561 7372 000000000 DE S-8 33 333-138578 061202810 2 CRESCENT PLACE OCEANPORT NJ 07757-0900 7328704000 S-8 1 y26896sv8.htm ORIGINAL FILING ON FORM S-8 EX-5.1 2 y26896exv5w1.htm EX-5.1: OPINION OF MAYER, BROWN, ROWE & MAW LLP EX-23.1 3 y26896exv23w1.htm EX-23.1: CONSENT OF ERNST & YOUNG LLP GRAPHIC 4 y26896y2689601.gif GRAPHIC