Microsoft customers downloaded 14 million copies of the Windows 10 upgrade on the first day of availability, the company said today.

The 14 million, just a fraction of what Microsoft hopes will adopt the new OS in the next three years, was served with little if any disruption to the Internet, or to the ISPs (Internet service providers) and CDNs (content delivery networks) that delivered the 5GB-plus upgrade files, according to an expert who earlier in the week worried that the massive traffic would present problems.

“We now have more than 14 million devices running Windows 10,” said Yusuf Mehdi, an executive in the Windows and Devices Group, on a Friday blog.

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