The best replacement for microsoft windows is linux.

The best alternatives to microsoft windows are rated as following:
★★★★★  linux
★★★  ubuntu
★★  unix
★★  microsoft office
★★  mac os
★  apple macintosh
★  apple mac
  x windows
  apple mac os
  microsoft windows
  redhat linux
  linux operating system
  google chrome os

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Google Trends

Scale is based on the average worldwide traffic of microsoft windows in all years. Click on graph for more.
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