The thing is Yahoo.com is the most visited site on the internet, even if the top level engineers leave Microsoft, the .com domain acquisition in itself would be a grand jewel.
Why? MS would be replicating content. They have the #5 site w/ MSN. MS biggest problem is competing w/ itself and they would be doing it again. They have MSN and Yahoo. If they keep both they have to pay for double the costs of running and maintaining the sites. They will have a brand-identiy problem. I mean, is it going to be Yahoo-by Microsoft, and oh hey, check out MSN for good stuff too?