Calendar Coloring in Lotus Notes:

Lotus Notes 8 has added two new coloring features to calendar. Now in addition to defining the colors for the different meeting types, we can now define how we want unprocessed meetings and cancellations to appear on the calendar.

In Preferenes -> Calendar & To Do -> Colors, there is a option to set colors for the New meetings and Cancelled meetings.
Here is an example where we invite a person to a meeting.

He has not yet accepted the calendar invite that is in his in-box, but Notes 8 now displays the unprocessed meeting on his calendar anyway.
After he accepts, it is displayed as we would expect.
Then as the chairperson we have to unfortunately cancel the meeting. The person has not had the time to open the cancellation notice in his email, but Notes 8 automatically changes the way the meeting is displayed on his calendar, visually informing him that the meeting has been cancelled.