OneDrive in Windows 8.1 is built into the OS - it shows up as a folder in Explorer. After reading your site, I'm still confused; how is ExpanDrive different / better than the OneDrive OS integration? Can you describe a scenario where ExpanDrive is superior to OneDrive + Windows 8.1? Also, once you've done that here, it would be great to add that to your advertising copy on your site - perhaps with a walk-through of the product to show how it's better than the built-in OS support :)