The acquisition of Aliso Viejo-based Quest Software by Dell has gained approval from the Federal Trade Commission, according to the FTC, Dell is buying Quest for $2.4 billion, as it looks to bolster its software business. The deal is worth $28.00 per share in cash, and came after an extended bidding war between a private equity group led by Insight Venture Partners and a stealthy buyer--Dell--which only acknowledged the deal after winning the bid for Quest.