Hi,
AFAIK evolution isn't just used as email client but also for some inner system messaging stuff I don't fully understand (yet).
On my system for example ther are three background processes running although I have never started evolution! These are:
"evolution-alarm-notify"
"evolution-data-server-2.26"
"evolution-exchange-storage"
Have you looked into the keyring settings (accessible under "system" menu, and then click through)? Maybe you can grant {whatever residues of evolution are still on your system} access to {whatever it wants to do} there? I've looked there myself but found no "evolution" entries. But I haven't set any keyring for it, after all...
(I sometimes feel the gnome keyring thingie is a bit buggy. But it was worse with intrepid than it is now with jaunty)
Hope this will sort out for you,
cheers
Dennis