You just use batch file that has a recursive for, for example:
buildall.bat that contains:
setlocal cd /D "D:\Visual Studio 2013\Projects" for /R %%i in (*.sln) do msbuild %%i
You just use batch file that has a recursive for, for example:
buildall.bat that contains:
setlocal cd /D "D:\Visual Studio 2013\Projects" for /R %%i in (*.sln) do msbuild %%i