Since every article you read now says Microsoft is doomed, that its products are irrelevant, that PCs are in decline and being completely replaced by tablets, that Apple is the world's most (or next-most) valuable company and iPads and iPhones rule the universe, et cetera, then it's probably going to get harder to ding Microsoft for being monopolistic.

Also, integration is good for consumers when it ensure things just work, and Microsoft's approach is not fundamentally different from Apple's or Google's. Indeed, Microsoft is arguably less monopolistic than both of those.

Finally, it's extremely easy to set Google as your default search in IE10. It just requires an extra step, which means most people won't bother. However, it's not clear why Microsoft should give Google $1 billion to $5 billion a year's worth of benefits for nothing.