Differentiate Presence between "busy" and "in a call"
distinguishing users who are busy from users which are in a call would be a great thing.
Currently they are both shown as Red and only on-mouse-over we see whether they are in a call or Busy.
We have many who plan their day in Outlook and are always "busy", but would be free for a call.
Maybe have them Dark-Red or with a phone symbol in it, like we have for DND