Do delete a conversation from your inbox you have to "Leave conversation". No delete functionality which is annoying.
Click on the 'envelope icon' - top right in the tool bar. Click on 'start new conversation'. Enter the user name of who you wish to converse with in the Participants field (see image below). If you type in the first three digits of their name it will predict the name(s).Ok so color me skewed, but how does one go about starting a new "conversation",
i.e., engaging in a new PM dialog with a member?