

If you are considering using Ubuntu or Linux in general, and opening Office document is an important point for you, you should look at the different office suites available, rather than the actual distributions themselves. If you use other software, you r mileage will vary, of course. Ubuntu comes with OpenOffice or LibreOffice, which should open "Most" of MS Office documents, although not perfectly. What will open documents will be the office suite or software that you will use.

Ubuntu, as an operating system (OS), will not open any document file by itself. A litthe bit like separating Microsoft Office from Microsoft Windows. The important point here is that you need to separate the office suite, such as OpenOffice or LibreOffice, from the operating system.
