Is there any way to start programming for Windows 8 mobile on Mac OS X platform. I'm already programming for iOS and want to developing for Windows 8 mobile but don't want to install Windows.
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Use the development tools from Microsoft for the purpose. Consider using virtualization software and install one of the time delimited trials from Microsoft to do so cheaply.
Note, however that this is still cheaper than if you were using Windows and wanted to write iOS applications...