LibreOffice is a great office suite, but it can't compete with modern apps that offer strong compatibility with Microsoft Office, and also work on mobile devices and the Web.
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Web 2.0 is built on the idea of styles, so it's astounding when the best and brightest of online applications fails to support styles in user documents.
Converting just about any file to PDF is as easy as hitting your Print button. Try going in the other direction and you'll meet an insane number of roadblocks and potholes. Here's a collection of conversion utilities to help you find your way.