In case you want to use your Surface Pro 3 as a complete Desktop, you may like to go ahead and order “Surface Pro 3 Docking station” from Microsoft store. The Docking station is available for pre-order from today. It is priced $199.99 and the availability is indicated from August 15th. Below is a comparison between original Surface Pro Docking station and the latest one.
Good news is that, with the new Surface Pro 3 Docking Station, one will be able to run up to 3 monitors (the Surface itself, and 2 external monitors) regardless of whether you have the latest daisy-chain capable DisplayPort monitors, HDMI inputs, or older analog screens (e.g. VGA or DVI).
