Admin center → Teams & groups → Shared mailbox. Licenses usually free; delegation cleaner.
Colored categories = routing: blue = billing, green = new business. Visible in one glance.
Notifications, noreply bounces and cc-noise auto-move to folders. Humans should only see human mail.
Assign category to self when picking up a thread. “I thought someone else had it” ends today.
Friday 15-minute sweep: anything unmarked after a week gets an owner assigned on the spot.