If you’ve got a Gmail address or use Google Apps for work, you’re probably busy navigating your Google-made inbox for a big part of the day. For all the time you spend in Gmail though, you probably aren’t taking full advantage of its tools: it’s simple on the surface, but packed with features, and changes all the time — it’s a Google product, after all. For example: Using Gmail as a task management system? Yup, that exists. Sending 10GB files over email? Yup, that too. And those brand new tabs at the top of your inbox that Google added?