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This came about as part of adding coverage for #41227. I see the following failure when overriding the project's tools version to something older and building via xbuild from mono 4.4.
> Error initializing task Message: Not registered task Message.
Diagnostic build output:
Steps to reproduce:
1. Download the attached project, and attempt to build with one of the following tools versions:
> xbuild /tv:2.0 ConsoleAppTest.sln
> xbuild /tv:3.0 ConsoleAppTest.sln
> xbuild /tv:3.5 ConsoleAppTest.sln
Mono JIT compiler version 4.4.0 (mono-4.4.0-branch-c7-baseline/5995f74 Thu Jun 2 15:13:10 EDT 2016)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
Created attachment 16206 [details]
simple console app
We deprecated xbuild and recommend using msbuild instead. Switching to msbuild will also most likely resolve the issue you reported.