- Desk phones
- Storage servers
- A server room
Obviously some companies have ditched the office space entirely, but in-person interaction is valuable for most types of businesses.
Going back further in time, we no longer need:
- Day planner
- Desk blotter
- Pen and paper
- Slide rule
With technological advances, several jobs have been reduced or replaced by software, or can be outsourced:
- Secretaries for filing and scheduling
- Tech support
- Paralegals for text mining
What else can -- or will -- go?