Comment 1 for bug 1189847

See if you can change the default size with dconf-editor. Use these commands:
sudo apt-get install dconf-tools
dconf-editor

Once dconf-editor is open, navigate to /org/gnome/evolution/shell/window
There, you should see settings for height and width. If they're 1902x30383, modify them to some sane value (480x640).