 Open Text Corp. OTEX, 0.08 shares sank 5 in after-hours trading Thursday after the company announced plans to acquire British software company Micro Focus MFGP, 0.97 at a valuation of 6 billion. Open Text said it would pay 532 pence for each share of Micro Focus, roughly double the stocks closing price on the London Stock Exchange, and assume the companys debt. 