Canada population in 2012 estimated is: 35,081,025 (I do not know the 2013 population). Anyway, the people who use Windows 7 in Canada is 32.3%, Windows XP users 30.56%, Windows Vista users 19.31%. The website (link in the "Sources and related links" section below) will tell you the rest of the other operating systems (if you're interested).
All versions of Windows would be used in Canada, like in any country. Many people would be using Windows 8. Many would still be using Windows 7, many using Vista, many using XP and so on.
Microsoft is not a windows application. Microsoft is the name of the company that creates many well known Windows applications. These include Microsoft Word, Microsoft Excel, Microsoft Powerpoint and Microsoft Access, amongst many others.
Many people think they are.
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It is still used by many people. Microsoft no longer supports or issue updates for it.
Updates for Microsoft Windows 2000 can be found in many places. This includes many places online including software sites and the Microsoft website itself.
Windows 7 was released quickly by Microsoft likely due to intense negativity to its predecessor, Windows Vista, which was very unpopular with many people.
Microsoft Windows Powerpoint 2007 is a program that is used in many different fields for presentations. Microsoft Windows Powerpoint 2007 is a program to create presentations in slides.
Windows Azure is a Microsoft Windows mobile service. It was developed for Windows Store, Windows Phone 8 and iOS devices. It has great reviews and seems to not have as many bugs as other services.
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Essentially there are three that Microsoft still makes available for general home use: Windows 7, Windows Vista and Windows XP.