I've used Sobi2 now for a couple of sites. The one perceived drawback was always the templating system and the need to "clone" the component if you wanted to have different looks.

With the addition of the template manager in the latest version you no longer need to clone the component.

Just be aware that some CSS, PHP and HTML knowledge is need to fully use this great new feature.

Works as stated. Simple module.

Would be excellent if the webmail could be configured to open in a wrapper though.