Dr. Mark Humphrys

School of Computing. Dublin City University.

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CA216      CA249      CA318

CA400      CA651      CA668

PC operating systems (single user)

Microsoft dominance. Been that way for a long time.

Usage share of PC operating systems, 2016.
Microsoft dominance, but not quite monopoly.
Even 1 percent of these numbers is millions of machines.

Desktop Operating System Market Share, 2016, by marketshare.hitslink.com

Usage share of desktop operating systems up to 2015.
From StatCounter.com (and main site).
Can get 2016 figures, but yearly plot is now broken?

PC operating systems

Feeds      w2mind.org

On Internet since 1987.