What’s the Difference Between Microsoft Office’s Desktop, Web, and Mobile Apps?

Microsoft offers several different ways to run the various Office programs—as desktop apps, as mobile apps for Android or iPhone/iPad, and online in a web browser. As you might imagine, the online and mobile app versions aren’t as robust as the desktop version, but you might still find them useful. And for some of you, they might be all you need. Here’s the breakdown.
by Walter Glenn via How-To Geek