Why do so many GNOME packages depend on evolution-data-server?

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http://askubuntu.com – I was notified of some updates today, but when I looked at the list I saw that they were all about evolution-data-server and evolution-data-server-common. My first thought was that "I don't use evolution at all, so why is this stuff on my machine?" I then went into Synaptic to purge all things evolution and to my dismay, removing the evolution-data-server-common has the side effect of removing all the Gnome applets, indicators, and several other useful features. Whats up with that? Honestly... (HowTos)