The writer seems to me to take an objective look at the question of, Should Microsoft do what Google has done with Motorola and buy Nokia?
There is an interesting coverage of the pro and cons with the conclusion that not buying and sticking with the status quo makes the most sense. In other words to continue with the current arrangement leveraging off each others strengths.
I tend to agree plus I can think of other reasons as well. The main one being that I think there are major "cultural" differences between the two companies due to where they are domiciled and their different heritages. I don't see it as a good mix for either company to be owned by the other.