I like Roundcube for its simplicity, where things can be done, but without calendar and contact integration it is really complicated. Whether on Windows, Linux or Mac, not having integration with the local application that we can access via our cell phone is also a mess in our digital life.
Having to depend on different applications and solutions to have synchronized contacts, a calendar in another app and always mixing personal emails from the domains we have, I still find it complicated. I would like to know if Roundcube itself has a plugin that helps close the gap between productivity apps.
I am installing Nextcloud myself to have files, chat, email and work solutions in one place.