Fix
bug 439620 - Calendars without proper provider deployment should be marked as "disabled". r=philipp
#ifdef MOZ_SUITE
messenger.jar:
% overlay chrome://messenger/content/mailWindowOverlay.xul chrome://messenger/content/msgViewPickerOverlay.xul
content/messenger/msgViewPickerOverlay.xul (resources/content/msgViewPickerOverlay.xul)
content/messenger/msgViewPickerOverlay.js (resources/content/msgViewPickerOverlay.js)
content/messenger/mailViewSetup.js (resources/content/mailViewSetup.js)
content/messenger/mailViewSetup.xul (resources/content/mailViewSetup.xul)
content/messenger/mailViewList.xul (resources/content/mailViewList.xul)
content/messenger/mailViewList.js (resources/content/mailViewList.js)
#endif