8. The method of claim 7, wherein the step of aborting the collaboration comprises: deleting the entry in the first calendar and the first list in the first instance of the messaging system; and deleting the entry in the second calendar and the second list in the second instance of the messaging system.
7. The method of claim 4, further comprising: continuing a collaboration when the selection is the other, until the selection is the affirmative or the negative; completing the collaboration when the reply option is the affirmative; and aborting the collaboration when the reply option is the negative.