Microsoft has regrettably removed the participants list from the window title for group conversations, so it is no longer for ManicTime to record the participants via CustomTitle. One is only able to change the "Conversation Subject" (the window title) for a group conversation prior to it actually being initiated. After that it is fixed as "Group Conversation (<n> participants)".

I don't know if Lync exposes the document or other info via some API the way the other office apps do, but if so, it would be preferable if it extracted the following as the document:

Conversation Subject (if set), else {participant list} (rather than just showing "Group Conversation", rendering most group conversations indistinguishable)