All day events currently work like untimed events in Needles 4 used to. They hide at the top of the screen and don't throw any scheduling conflicts. This is a good functionality of untimed events and should be kept in Needles 5 as untimed events, but all day events should block out the entire calendar day and throw scheduling conflicts when someone tries to schedule over them. For example it becomes too easy to miss an all day event for a vacation and then have clients scheduled to come in and meet with someone who won't be there.
Just as the checklist keeps firms on task with what they need to get done, the calendar is the heart and soul of many firms in managing their time.
Please make this change. Huge potential for accidently creating calendar conflicts.