One of the downsides of owning a smartphone, tablet and a computer, is that you can miss important messages if they only land on one of that trio. That's the thinking behind the latest Skype update, which will now sync your chats across all of your devices. The tweaks also bring push notifications, alerting you to new messages and, perhaps best of all, delivery receipts, so you'll always know exactly when your missives have been read -- or ignored.