- aQuantive's Atlas was a distant number 2 to Doubleclick's DART in terms of ad server market share
- aQuantive had no plans to create an ad exchange, nor did their market share make that a credible possibility, and
- Microsoft somehow paid twice as much for aQuantive as Google paid for Doubleclick.
All told it was a bewildering acquisition. Either Microsoft didn't understand why Google bought Doubleclick, or Google corpdev did a masterful behind the scenes headfake with regards to the value of aQuantive.
Yahoo at least understood what the DCLK acquisition was about and bought Right Media. Of course, an open ad exchange is basically at odds with Yahoo's premium inventory direct sales strategy, so it has been difficult for Yahoo to really make it successful.
In the end the whole episode was a giant win for Google, and an embarassment for MSFT and YHOO.