MS Office for a Mac works well but I found it disappointing that the bells and whistles don't LOOK like MS Office. To do this perfectly you will have to purchase MicroSoft Office for OSX (expensive unless your workplace offers you an employer version, then it is cheap like dirt). TextEdit and Bean will open MS Word files but not perfectly. Another free & excellent OSX WP is 'Bean'. In addition to everything said here - OSX TextEdit has plain text (can be configured to act much like Notepad) and rich text.
