This blog over at ZDnet published a letter from Salesforce.com's Marc Benioff CEO to employees about Oracle's acquisition of Siebel Systems. Benioff writes, "Siebel on Demand, a joint venture between Siebel and IBM, will be the first to be buried. Siebel on Demand is written exclusively on DB2 and WebSphere and runs in IBM data centers. Oracle will kill it. Oracle does not sell DB2."