Clickbait title: Windows Phone didn't "overtake" Blackberry so much as the Blackberry sales declined below the entirely flat sales of Windows Phone.
This is an article that describes the continued decline of Blackberry sales, as compared with the flat sales of Windows Phone; which shouldn't really seem newsworthy.
Actually, the sales for Windows Phone increased, it was just the market share that was flat (as the market as a whole expanded). Be careful about the difference between flat market share and flat sales; they are not the same in a growing market.
More like Blackberry "undertook" WP in US, since its decline rate has been much faster than WP's growth rate in US.
Sites like TheVerge [1] said exactly the same thing when it happened worlwide, that WP overtakes BB, even though this is how the market share charts were looking like back then:
As you can see WP's growth was snail pace back then, yet it "overtook" Blackberry. We're seeing the same kind of misleading headlines now, I guess because they get more hits and shares from Microsoft fans. Journalism at its finest.
At first I thought this was about some trademark infringement lawsuit with a Blackberry clone called "Bloackberry". Then my eyes jumped to the non-misspelled words...
This is an article that describes the continued decline of Blackberry sales, as compared with the flat sales of Windows Phone; which shouldn't really seem newsworthy.