Our review of the Creators Update for Windows 10 Mobile may have shown it to be a half-hearted update at best, but a substantial portion of Microsoft's base of installed phones won't even have a chance to experience it.

A report by AdDuplex, an ad network running on top of Windows devices, found that four of the top 10 Windows phones won't be allowed to upgrade to Microsoft's latest feature update. That works out to about 40 percent of all Windows phones already in the hands of users.

windows phone market share adduplex AdDuplex

Only 6 out of the top 10 best-selling phones are eligible for the Windows 10 Mobile Creators Update, AdDuplex found.

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