Thanks, Michael. I already have Dropbox and use it for Notation and 1Password. I didn't know I could put Calendar and Contacts in there! Sorry, my knowledge is limited but I'm trying to learn.
I've not yet upgraded to Mavericks, partly because of the Contacts issue as I previously had related.
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Understandable, don't want to upgrade when you lose something. That's not an upgrade in my books. Maybe with 10.9.1, they'll fix that. Also, thanks for what?