Uptake of OS X 10.11, aka El Capitan, remained sluggish in January, new data shows, suggesting that, like Microsoft, Apple has trouble convincing customers to adopt the newest operating system.

Four months after Apple launched El Capitan, the OS powered 44.8% of all Macs, according to numbers published Monday by U.S.-based analytics firm Net Applications. That was an increase of about two percentage points from the month before.

Net Applications estimates operating system shares by tallying unique visitors to its clients’ websites. In the absence of definitive data from Apple, that user share is one of the few proxies for real-world OS X adoption.

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