estimated number of operating sysytems on macosx???

I think we need an explanation about your question...
Do you want to know how many generations of Mac OS X software there have been?
About 8, depending on when you start counting.
Or do you want know how many different versions of operating systems have been produced by Apple, starting with System 2, I suppose.
So, about 14 or 15, (depending on how you count the various versions)
Then, there's been other apple-provided OSes that others can rattle through like AUX, and the older versions of MacOS Server.
Other operating systems, such as various forms of Unix, and Linux, and others have found their way onto the Apple and Mac platforms over time.

Can you rephrase your question so that we can provide you with a better answer?
 
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