You don’t have to use Brosix, but if you do so for a while you will discover it is very easy to use, full of many useful features and is completely free for personal use. For business use it has an Enterprise version which is available at a very competitive price.
Brosix Enterprise adds features specially designed for corporate use. It puts together everything you need for managing real-time collaboration and communication in your company, organization, team or group. With Brosix, employees get the instantaneous convenience of instant messaging and employers can control its use.