1) Log as root
2) Execute "rpm -qa|grep evolution"
3) Check the resulted rpms
4) If you want to uninstall, then execute the following
Shell>rpm -e evolution-2.8.3-2.fc6 evolution-sharp-0.11.1-10.fc6 evolution-webcal-2.7.1-6 beagle-evolution-0.2.13-1.fc6 --nodeps
3) Install with yum, execute following command
Shell>yum -y install evolution
