Any other system requirements I need to know about?
Besides that aforementioned Office 365 subscription, you'll need to have an iPhone 4, 4S, or 5, or a fifth-generation iPod touch. Those devices need to be running iOS 6.1 or later. And if you want to take advantage of features like Resume Reading (which lets you pick up in a document where you left off on your computer) or Recent Documents (in which you quickly access on your iPhone what you've recently worked on back at the computer), you'll need to have Office 2013 installed on a computer somewhere. That's the Windows version of Office, by the way.
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