Unibox is not available for Windows but there are some alternatives that runs on Windows with similar functionality. The best Windows alternative is Postbox. It's not free, so if you're looking for a free alternative, you could try Spike or Kiwi for Gmail. If that doesn't suit you, our users have ranked more than 25 alternatives to Unibox and six of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Unibox are TypeApp (Free Personal), Twobird (Free) and WunderMail (Freemium).
Postbox is an email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even the most demanding workloads.
Bring your workspace together into one unified app. It’s everything your team has been looking for in a productivity and messaging app, but easier, and all with your email. Welcome to the shortest path to done.
TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various providers, allowing for smart push notifications while enabling personalization across multiple email accounts.
Kiwi for Gmail (formerly Gmail for Mac) turns Gmail into a full-powered desktop email client. No one wants to use Gmail in the browser on their phone, and we felt they shouldn't have to on Mac or Windows either.