TreePad, developed by Freebyte , was a pioneering Personal Information Manager (PIM) that combined a tree-structured database with a word processor. The Business Edition specifically offered:

TreePad Business Edition 7.75 is a comprehensive PIM (Personal Information Manager) and note-taking application developed by The Focus Group. It is designed to help users manage their tasks, contacts, appointments, and notes in a single, unified interface. The software is particularly noted for its hierarchical organization structure, which mimics the way we think and organize information - in a tree-like structure. This makes it incredibly easy to categorize, access, and manage large volumes of information efficiently.

Which of those would you like?