After installing, I tried to open up a couple of work documents and the first thing I found was that Office cannot edit .doc files, only .docx. Even with a docx file, you can't much more than basic text editing.  There is no support at all for tracked changes, an important feature for anyone doing collaborative work.  

For the same free price as MS Office Mobile, you can also get Quickoffice or Documents to Go, both of which support multiple file formats

Docs to go also supports tracked changes. Don't waste your time installing this.?