Why is Microsoft Exchange so popular? [closed]

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Microsoft Exchange market share is generally quoted to be very high.

What are the technological factors which put Exchange at an advantage over its competitors, that is, other alternatives? Are there any open-source options?

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http://www.thehostingnews.com/xs-benefits-exchange-enterprises.html

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Because there is such a huge market of people using Outlook as a client. If that is an enterprise wide fact, then the techies find it easier to go with an integrated solution.

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A core advantage of Exchange is that it integrates very easily with Microsoft Active Directory. (Same vendor benefit)

Lotus Notes is the main competitor (in the enterprise).