Acquisitions and mind control or just business as usual

Google is up in arms over Microsoft's proposed takeover of Yahoo. Is this just good business sense for two merging companies or is it the death of the internet as Google knows it?  Is the openness and innovation of the internet in jeopardy? Does this mean that if Microsoft buys Yahoo that all "PC's" will be loaded with the Yahoo toolbar? Is Google, who enjoys over sixty percent of the internet search market truly worried that Microsoft will abandon privacy protection and let the government in our secrets, or are they just worried about market share? Either way, the always evolving landscape of the internet is changing and it appears that the new boss is the same as the old boss.