B4A is a framework that is for the most part similar to VB.Net but it is used to create mobile apps. It is a mobile cross platform development environment similar to Xamarin
I want to use B4A to create a similar Email app to K9 which is an open source Android app available on Github and which I have source code for so you can see how it works.
The app is an email client. You can also look at Blue Mail as one example of the objective.
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I have B4A fully licensed and can provide a copy of that. B4A already contains many Libraries and users have also contributed their Libraries.