Image Source The Problem. "A Student sent me this Pages file, but I can't open it!" The cries of the teacher were heard across the EdTech office. Administrators calling the office... "Hey, I upgraded to Mavericks, and installed the new Pages... now people getting my Gmail attachments tell me they can't open it." We were at the start of a problem. At Korea International School, we were mostly running MacBooks running the "Lion" operating system. But there was this new operating system, "Mavericks" that was free from Apple to download. It was time to make a change, and do some Professional Development. With the lesson, we already identified the need. As it is a new operating system, there are many students upgrading their systems, many students have been sharing files to turn into their teachers, but teachers having troubles opening them. Administrators were having trouble attaching files to their GMail. In this lesson, it i...