After offering $200 for an iPhone or iPad, Microsoft is back with another promotion designed to tempt Apple hardware owners over to its own devices. This time it’s the Surface Pro 3, the tablet that can replace your laptop according to Microsoft. The software giant is offering up to $650 when MacBook Air owners trade-in their laptops for a Surface Pro 3 between June 20th and July 31st. Microsoft doesn’t mention which models are eligible for the promotion, but the MacBook Air laptops must be in working condition and traded within Microsoft Stores in the US and Canada.