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The source is CSV spreadsheet which a person can download on the StatCounter Global Stats page. The file has more information than the graph on the same page. It does not have all versions of Windows. And it should not. Does somebody use Windows 1.0 nowadays? I highly doubt! And it doesn't matter what Microsoft has sold before. It is not about sales. It is about usage share. The usage of the systems does matter. Windows Phone includes all its versions. They just haven't divided it. Windows Server systems are probably rarely used. I do believe they are used in small amount, which is surely important for the stats too. But I haven't found any stats source which includes all of these systems.
I haven't found any complete sources of usage share that have all contemporary operating system versions of Windows in the list. If you can help here, I appreciate it.
I want to say Thank You, Lisa, for your contribution to Wikipedia. I respect you for that and look for any recommendation or help from your side to make Wikipedia better.
It is easily acceptable that Windows 1.0 rarely used these days. Saying that Windows Server 2012 has 0% market share is impossible to swallow. Even then, I still don't see Windows Server 2003 on your new CSV source.
I highly doubt that somebody uses Windows 1.0 nowadays. And by "use" I mean use in everyday tasks. But, of course, it is possible, maybe only in a virtual machine, and mostly for fun. Also, agree with you about Windows Server 2012. It must be some amount of users out there, but the source doesn't have this system.
There is Windows Server 2003 in the CSV source. Look carefully, please. You will see "Win2003" there.