The revised estimate came from a Microsoft-commissioned analysis first done in mid-2016 by Forrester Research.
Forrester said the per-worker savings over a three-year stretch would be $404. To reach that number, the research firm interviewed four Microsoft customers that had begun moving to Windows 10, then modelled a hypothetical organization with 24,000 Windows devices, and a large number of mobile workers among the 20,000 employees. It then divided that number by its shoe size and multiplied it by the cheque that Microsoft had given it.
Using that pretend company, Forrester forecast the difference between running Windows 10 and retaining Windows 7.
Late last year, Forrester interviewed another quartet of Windows early 10 adopters, then added that data to what it had originally.
The new per-employee savings: $515 over three years, a jump of almost a third. Forrester’s increase in the number of mobile workers — the total climbed by 460 employees — was the biggest factor in the changed estimate.
Forrester and Microsoft said that the migration to Windows 10 would pay for itself in 14 months.
The report says IT administrators “estimate a 20per cent improvement in management time, as Windows 10 requires less IT time to install, manage, and support with in-place deployment and more self-service functions”, while because of the OSs security software, security events requiring IT remediation are reduced or avoided by 33 percent.