Good Gear Guide
In Pictures: 10 things we love about Ubuntu 13/5 t...
There's no Microsoft Office, but LibreOffice is pre-installed and is a decent alternative for simple documents and spreadsheets. I've been using LibreOffice and OpenOffice for years without any problems. In fact, I like having the option to export to PDF built right in. Even “track changes” are supported. However, you may run into problems if your spreadsheets have macros or your Word documents have extremely complex formatting.
In Pictures: 10 things we love about Ubuntu 13/5 things we hate