Hi folks. I bet there is a simple answer to this question, but I haven't been able to figure it out on my own. This week I upgraded my iPhone 5 to an iPhone 7. iMessage works on the iPhone 7 (iOS 10.1.1). It works on my MacBook Pro 13" with Superdrive (mid-2012) (OS X 10.11.6) But the two are not synched. They were with the old phone, but aren't now. How do I get them to sync? What am I missing?