I’ve always been uncomfortable with the presumptuous “I’ll call you Thursday at 4”. Though I am an absolute advocate of controlling the next step in the sale, it is too aggressive to state unequivocally when you’ll do what. Today’s buyer doesn’t want to be pushed into anything; she wants to collaborate on the best options to bring the greatest amount of success into her world.
By the way, sending an outlook calendar request is definitely off the charts bad for a seller initiated call. If the buyer asks you to call, you get to be as proactive as you’d like.