slide/mono — comment on commit 407dd029e3f1ec712a7f6a8b684b8ee8d2a18b61
File: mcs/class/Microsoft.Build.Tasks/Microsoft.Build.Tasks/Copy.cs line 207
By radical:

The targets file and thus the version of the tasks to be used is chosed based on the ToolsVersion. That is why I said that run msbuild with "/tv:2.0".

Also, I suggested this to check what the 2.0 Copy task does (which lacks the OverrideReadonlyFiles property).