and firstname.lastname@example.org. Both "sets" are showing up under Calendars (in the uppers left corner) on my iPhone 4S. The names of the calendars (Work, Home, Boat.... etc) are the same except for one set has my email@example.com and the other set has firstname.lastname@example.org. Can I delete either/or and still see them on both my iPhone and Mac? And... which should I delete... the cal.me.com or the me.com. I'm a bit frightened in "just experimenting". Thanks for your help.