Although the Web version of Office lacks many of the advanced features of the desktop software, such as ruled margins and the ability to track changes, Microsoft promises "fidelity" between the two versions, so there's no loss of compatibility.

(Here is the full rundown of limitations for , and on the Web.)

And of course, unlike desktop Office, the Web version is free. With the latest improvements, the apps are a fine choice for basic document editing across multiple devices, especially if you're running to keep your files in sync.