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Creating a Microsoft account for use in Visual Studio 2015 means that you will get a better and optimized user experience, with several benefits.
Some of the purposes why you should create an account are:
1. free software, training and support from Visual Studio and broad range of benefits
2. synchronized Visual Studio Settings, which means that you will have for example the same layout, window and color theme, or whatever you select in the settings, every time you log in with your account
