To improve our service we have decided to no longer offer RainLoop.
When we initially started with RainLoop, we did this because it offered a much more modern interface, it was also more configurable.
In the meantime Roundcube has caught up with RainLoop and we decided that it's important to focus on one web-mail.
When will it be disabled?
We have added 'deprecated' warning to the RainLoop login page for over a year now. On March 1st 2021 we will switch off RainLoop and it will no longer be accessible on and after that date.