Personally, I miss my day planner. Not only could I jot down notes of what I needed to bring to a meeting or what to prepare for, or if I needed to remind myself of something or just enter any notes I chose to add. The best part was I was precisely organized with accessibility in one place on the correct date and time.
I love using Outlook. Some love Google calendar but the reality is that you can’t see everything at a glance like you can with a day planner in hard copy.