John Kirk for Techpinions:

In 2012 there were more Android devices sold than Windows devices. By the end of 2013, it is probable that there will be more iOS devices sold than Windows devices too. If so, by the end of this year, Windows will be only third in terms of OS sales.

They still make a metric buttload of money, but they’ve been bypassed in relevance, as has the platform they make much of their money from.

[Addendum: Originally Kirk had stated there are more Android users than Windows users but it was updated after Benedict Evans noted Android’s still a couple of years from achieving that.]