[ubuntu] How to change default applications registered with Ubuntu's default messaging menu?

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http://ubuntuforums.org – As default, following applications are registered with messaging menu. HTML Code:     Chat-> Empathy     Mail-> Thunderbird What I want to do is: HTML Code:     Chat-> Pidgin     Mail-> Evolution If you install evolution (& evolution-indicator) or pidgin it will appear as a seperate menu inside messaging menu.It doesn't register with default menu , even if you uninstall the default applications. The only way to remove them(default chat & mail menu) is to blacklist them. A trick that has worked before ----- (Hardware)