IBM Lotus Notes Traveler before 8.5.1.2 allows remote authenticated users to cause a denial of service (daemon crash) by accepting a meeting invitation with an iNotes client and then accepting this meeting invitation with an iPhone client.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2010-4514
http://www-10.lotus.com/ldd/dominowiki.nsf/dx/Lotus_Notes_Traveler_851_FP3_Release_Notes