If you follow our blog posts, you have heard us mention OffiSync.
OffiSync is an add-on for MS Office that lets user save, share and collaborate via Google Docs and Google Sites from within Word, Excel, and PowerPoint.
OffiSync lets users keep working with their familiar office suite applications while taking advantage of the collaboration features of Google Apps (all versions). The add-on also minimizes user concerns about functional differences with Google Documents, Spreadsheets, and Presentations.
Learn more here.