Two women will succeed Steven Sinofsky, the former head of Microsoft's Windows unit who unexpectedly left the company this week. "It’s a sign that companies are recognizing the positive impact of women at the senior executive levels and on corporate boards," said Phyllis Kolmus, president-elect of Women in Technology. “They bring collaboration and kind of a broader view,” she said. “What if it had been Lehman Brothers and Sisters? There might have been a very different outcome…"