Did you know that you can change the text and formatting of email notifications sent by activeCollab? To do so, just go to Administration and click Email Templates icon:

activeCollab will then list all available templates, grouped by the module they belong to. To change one of the templates, simply choose it from the list and once you are on the Template Page click the Edit link bellow the message body text.

All variables that can be used in the template are listed below the Body text field.