ReportGenerator converts coverage reports generated by OpenCover, dotCover, Visual Studio, NCover, Cobertura, JaCoCo, Clover, gcov or lcov into human readable reports in various formats.
To learn how to use ReportGenerator have a look at the:
The Publish Code Coverage Results task from Microsoft regenerates the report with different settings and based on the supplied Coberatura file (see announcement). Moreover it does not necessarily use the latest version of ReportGenerator.
The screenshots show two snippets of the generated reports: