Great news for those of you who use Evolution and Ubuntu 11.04 Natty Narwhal (either with Unity or the classic Desktop): the PPA that provides a patched Evolution indicator which allows you to close Evolution (this basically minimizes Evolution to the Messaging Menu) and still get new mail notifications -, has finally been updated for Ubuntu 11.04 Natty Narwhal.
To install the patched Evolution Indicator, use the commands below:
sudo add-apt-repository ppa:goehle/goehle-ppa
sudo apt-get update
sudo apt-get install evolution-indicator
Once installed, you may need to log out and log back in.