Well alpinejohn, you may well be correct. I don't use Evolution but have not uninstalled it and System Monitor displays three sleeping processes originating from Evolution; evolution-addressbook-factory, evolution-calendar-factory and evolution-source-registry. I suppose that they could be sucking the marrow out of my OS but not by more than a tiny whisker, probably at start-up. Removing Evolution might give someone else a minuscule benefit. Nice call.