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Recall that Mono is an open source implementation of .NET for non-Windows platforms. It implements the Common Language Runtime (CLR) and C#. There will be some scenarios where Mono does not accurately mimic the .NET behavior. The Mono Tools for Visual Studio help you deal with some of these differences.
There are three versions of Mono Tools: (1) Professional, (2) Enterprise, and (3) Ultimate. The cost ranges anywhere from $100 to $2500. Although these are not Microsoft tools per se. Mono is a high visibility project. So I thought I would cover the Mono Tools here today.