Is "iCloud Drive" different from "contacts and calendar" syncing? I've updated my iPhone and iPad to iOS 8.1 but not yet done the upgrade to iCloud Drive. My computer at work will likely stay on Mavericks for a while (until the IT folks are ready to make the switch), so it wouldn't be able to access iCloud Drive. Here's the question: If I do the upgrade to iCloud Drive, will my work computer (running Mavericks) still sync contacts and calendar data with iCloud? Or will it be completely out of sync with my iPhone and iPad?