FORTUNE -- The report issued Thursday by Chitika Insights calls it "the power of free" -- a reference to the price Apple (AAPL) charged Mac users to upgrade to Mavericks, the latest version its flagship operating system.
Sampling its ad network last week -- five months after Mavericks' release -- Chitika found that 40% of its clients' page views were coming from Macs running Mavericks. That's six percentage points better than Mountain Lion ($19.99) reached on the same ad network after nearly 14 months.
It may be a record for a computer OS. Nine months after Windows 8 came out, it still hadn't achieved 5% penetration (see here).
But 40% pales compared with the upgrade rates on Apple's smartphones and tablets, where after six months, iOS 7 users were generating more than 80% of Chitika's iOS Web traffic in the U.S. and Canada.
"That disparity," Chitika suggests, "is likely at least partially a function of the nature of the desktop marketplace, where computers are typically kept for a longer period of time as compared to mobile devices, and hence may not necessarily be upgrade eligible. Additionally, a larger and much wider range of users in terms of economics, age and other factors regularly browse using desktops and laptops as opposed to smartphones and tablets, which have user bases skewed more tech-savvy as a whole. Finally, unlike on iOS, where users receive a direct prompt to upgrade to the latest OS version, Mac desktop and laptop users were not actively solicited to update to Mavericks."
Harvard's Lawrence Lessig puts his finger on the problem with Apple's software updates.
FORTUNE -- I was lucky. As soon as they were available, I installed Apple's (AAPL) new software suites on all three of my workday computers -- iPhone, iPad, MacBook Air -- and have yet to come across a stumbling block serious enough to prevent me from doing my job.
Harvard Law professor Lawrence Lessig -- one of the most MOREPhilip Elmer-DeWitt - Nov 4, 2013 8:03 AM ET
The fastest adoption rate on record of any operating system update.
FORTUNE -- According to the latest full day's report from Mixpanel's handy little widget, 71% of iOS device owners had upgraded to iOS 7 by Monday, 27 days after Apple (AAPL) released it.
Last year, it took 30 days of iOS 6 to reach a record 61% penetration.
By contrast, Windows 7 is still at less than 50% four years after Microsoft (MSFT) MOREPhilip Elmer-DeWitt - Oct 15, 2013 7:02 AM ET
Stop the presses: iOS 7 can cause dizziness, vertigo, vomiting.
FORTUNE -- You knew there'd be something.
Last year it was the iPhone app that replaced Google Maps.
In 2010 it was the iPhone 4's external antenna.
In 2011 the headlines that followed the introduction of the iPhone 4S were dominated by Steve Jobs, who died the next day.
If there has ever been a product launch in the modern history of Apple (AAPL) that MOREPhilip Elmer-DeWitt - Sep 28, 2013 10:49 AM ET
This (fuzzy) table of worldwide release times appears to be accurate.
FORTUNE -- It's a good thing that not all of the nearly 700 million iOS devices that Apple (AAPL) has sold will be trying to connect to the company's servers at the same time today. But plenty will.
The first wave of early adopters could face a bumpy download.
And given the natural human resistance to change -- especially change as radical MOREPhilip Elmer-DeWitt - Sep 18, 2013 11:00 AM ET
It would be the biggest iPhone deal ever, seven times larger than the one with Verizon.
FORTUNE -- Apple (AAPL) is preparing to ship its as-yet-unannounced mid-range iPhone to China Mobile (CHL), the Wall Street Journal reported Friday, citing unnamed sources "familiar with the matter."
If the two companies have indeed signed a contract -- something the Journal's sources could not confirm -- it would be the biggest carrier agreement Apple has MOREPhilip Elmer-DeWitt - Sep 6, 2013 6:47 PM ET
Developers praise Apple's willingness to take their feedback to heart.
FORTUNE -- Can you see the difference between the two paragraphs of text above?
The top one is set in Helvetica Neue Light, the system font Apple (AAPL) chose for the beta version of iOS 7 released at its developers conference in June. It was widely criticized as too hard on the eyes.
The bottom paragraph is the system font in the beta MOREPhilip Elmer-DeWitt - Jul 9, 2013 5:25 PM ET
"To avoid criticism," Aristotle wrote, "say nothing, do nothing, be nothing."
FORTUNE -- The critical reaction to Apple's (AAPL) WWDC keynote Monday reminds me of the classic Borowitz Report headline:
REPUBLICANS: OBAMA MUST TAKE ACTION IN SYRIA SO WE CAN CRITICIZE ACTION HE TOOK IN SYRIA
You might not know it from reading Techmeme or Business Insider, but the reaction to iOS 7 was not overwhelmingly hostile. In fact, according to Synthesio, which monitors social media, the iPhone's new MOREPhilip Elmer-DeWitt - Jun 11, 2013 2:26 PM ET
Wall Street's initial reactions were measured but positive. More as they come in.
FORTUNE -- Analysts who follow Apple (AAPL) may have needed more time than usual to sort through their notes from Monday's over-stuffed WWDC keynote, because by 11 p.m. EST only a handful had filed notes to clients.
Excerpts below of the ones we've seen. New ones will go on top.
JP Morgan's Mark Moskowitz: No Needle Mover, but the Building Blocks MOREPhilip Elmer-DeWitt - Jun 10, 2013 10:59 PM ET
A new look, new services and maybe new MacBooks at Apple's developers conference.
FORTUNE -- The annual gathering of Apple (AAPL) developers -- which sold out in less than 2 minutes when tickets went on sale in April -- kicks off Monday with CEO Tim Cook's keynote at 10:00 a.m. PST (1:00 p.m. EST) in San Francisco's Moscone Center.
There is, as usual, much fevered speculation among the Apple bloggers about what MOREPhilip Elmer-DeWitt - Jun 8, 2013 8:19 AM ET
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