For now, you can enjoy using Mailbird on any Windows computer, as long as it runs Windows 10 or higher (please take a look What versions of Windows are supported by Mailbird to find out more about this topic).
However, watch this space! Later this year, we'll be releasing a brand new cross-platform application which is currently in development. Initially it will be for MacOS, but eventually it will also be available for Android and iOS devices.
For any questions, feel free to reach out to our Customer Happiness Team by clicking here.