Microsoft Helps AppNexus Raise $50 Million Third Round

Real-time bidding for display ads has certainly come into its own this year, and one of the early stars of the space, AppNexus, has raised a whopping $50 million third round. Microsoft (NSDQ: MSFT), previously just a client, is now an investor as well, though it didn’t say how much it was putting into the New York ad tech firm, which is run by AppNexus CEO and co-founder Brian O