Lotus Organizer is a personal information manager

Personal information manager

A personal information manager is a type of application software that functions as a personal organizer. The acronym PIM is now, more commonly, used in reference to Personal information management as a field of study...

. It was initially developed by Threadz, a small British

British

The word British is an adjective referring in various ways to the United Kingdom or the island of Great Britain and its people and language.People...

 software house, reaching version 3.0. Organizer was subsequently acquired by Lotus Development Corporation, for whom the package was a Windows-based replacement for Lotus Agenda

Lotus Agenda

Agenda is a DOS-based personal information manager, designed by Mitch Kapor, Ed Belove and Jerry Kaplan, and marketed by Lotus Software.Lotus Agenda is a "free-form" information manager: the information need not be structured at all before it is entered into the database...

. For several years it was the unquestioned market leader before it was gradually overtaken by Microsoft Outlook

Microsoft Outlook

Microsoft Outlook is a personal information manager from Microsoft, available both as a separate application as well as a part of the Microsoft Office suite...

. It is also the only PIM package recommended by the British Philosophical Association.

Organizer is notable for using the ″leather-bound personal organizer″ graphical metaphor for its user interface

User interface

The user interface, in the industrial design field of human–machine interaction, is the space where interaction between humans and machines occurs. The goal of interaction between a human and a machine at the user interface is effective operation and control of the machine, and feedback from the...

.