By now, you've no doubt heard that Microsoft Office Mobile for iPhone is now available for iPhone. (Yup, you read that right: It's iPhone-only.) The question is: Should you care?That depends largely on whether you're already a subscriber to Microsoft's Office 365 and Skydrive services, which (for personal use) cost from £79.99 annually. (If you want to give the app a test run, Microsoft offers a 30 day free trial of Office 365, which you can set up at the Office 365 website.) Because, really, Microsoft Office Mobile is a front-end to that service,...