C# VS C++: For IM Project [closed]

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Our company will start a new project about IM. Currently we have a framework in C++ for IM. But someone thinks C# is better for the project. As I know, Yahoo ever started an IM in C# but gave up at last. Is there any idea about the prons and cons of C++ and C# for the IM project? We only care about windows platform.

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There's nothing specific to IM that is going to alter the C++ vs C# debate. The pros and cons will be the same as they are for any other project. You'll have to weigh the speed of development, the speed of bugfixing, the ease of finding developers, and the ease of deployment and come up with an answer.