Do you have to have a gmail account and a gmail address to get all the benefits from the default calandar? I cannot get my two iPads to sync. All answers point to a gmail account with a gmail address. I don't want a gmail address. I have my yahoo email address for over 15 years and don't want to change. It seems I am being "forced" to use gmail. Am I missing something? Or, am I stuck with gmail if I want to have a fully functioning defauls calandar system? Thanks in advance for helping me with this.