Description on website and retail packaging claim "Full Windows 8.1".  The version installed is actually Windows 8.1 with Bing.  While misleading, if you do some research, these are actually very similar except Bing has to be the default search engine when product is shipped.  I needed this for Windows Media Center and as some reviewers claim, this is not Full Windows 8.1 and more importantly not the Pro version claimed by some that is required for the option to add the  Windows Media Center Pack.  This was my intended use, so I returned the item.  The product seemed solid and if it would have fit the need I had for it, I'm sure it would have worked fine.  If you just need a small form factor PC for web usage and low CPU tasks, this appears to be an excellently designed product.