A:AnswerYes it is perfect for all of these things. Everything you mentioned is done using a web browser. The N4500 and 4GB memory are more than enough for what you are doing.
A:AnswerNo, it runs an operating system called chrome OS which enables you do use it with the chrome browser, web based apps like office 365 or googles office tools. It can also run android apps through the google play store.
If you put windows on this, it'd wheeze pretty badly. chrome OS is a much smaller, faster OS.
You might find that you can do most if not everything you do with windows with a chromebook. Look for some guides on windows to chromebook migration to see how.
A:AnswerFor my viewing tastes it is excellent. Good color, vivid clear picture. Spinning wheel is gone. When I first got it, I watched a HD travel video and it was AMAZING how clear the picture was. Almost like being there.