I use my 15" MBPr as much as humanly possible for my job. However we've adopted SharePoint as a solution for internal communication (Intranet) and I just need Windows sometimes to be able to do all my job functions. the 256GB SSD is fine for OSX, but not even close if I want to dual boot. Question 1: can Windows be installed as a bootable drive on an external Hard Drive or SSD that connects via USB? Just plug it in and reboot? Question 2: If Q1 is possible, can I run a VM of Windows using this same method? Question 3: External Hard Drive or SSD?? Thunderbolt or USB3 for speed?