I've apt send by me with others. when editing subject and notes, you will be
prompted with 3 options, 1. save and send, 2. save changes but don't send, 3
cancel.

But when you edit the location, you are only prompted with 1. save and send,
2 cancel.

outlook 2003 was able to let you save and don't send when editing any field.

Is this a bug?