Windows 10 will replace the aged Windows 7 as the most popular version of Microsoft's operating system in September, according to the rise and fall of the two editions' user shares.

But that won't be the end of Windows 7. Those same trends argue that when Microsoft declares Windows 7 obsolete - and thus, no longer provides it with security updates - the operating system will still account for more than a third of all copies of Windows then in use.

Those projections are derived from data published by analytics vendor Net Applications of Aliso Viejo, Calif., which on Monday revealed the December numbers for Windows 7, Windows 10 and other OSes. Net Applications' user share is an estimate of the percentage of the world's personal computers powered by a specific operating system.

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