Oracle said it will <A HREF="http://news.com.com/Oracle+to+buy+Siebel+in+deal+worth+5.8+billion/2100-1">acquire Siebel Systems</A> in a deal worth $5.8 billion. CNet reports that Oracle will offer $10.66 for each share of Siebel stock, a nearly 17 percent premium over the company's $9.13 closing price Friday. The deal, subject to approval by Siebel shareholders and by regulators, is expected to close next year.