Re: NVDA and a free office
V Stuart Foote
Both LibreOffice and Apache OpenOffice offer good no-cost open source assistive technology tool support on Windows having implemented the IAccessible2 API.
LibreOffice-- http://www.libreoffice.org/download/libreoffice-fresh/ (5.1.2 build released 2016-04-01 in either 32-bit or 64-bit, as opposed to the 5.0.5 build released 2016-02-08)
Apache OpenOffice -- http://www.openoffice.org/download/index.html (4.1.2 build released 2015-10-30)
The Apache project limps along, but the 4.1.2 build should suffice for use with NVDA releases, but I would choose a LibreOffice build as its development model offers more resources for addressing any functional issues.