IBM Lotus Organizer

It was initially developed by Threadz, a small British software house, reaching version 3.0.

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

The latest releases of SmartSuite did not include the current version of Organizer; it was sold separately only.

It lacks later improvements, such as importing and exporting vCard and iCalendar files, and synchronisation with PDAs.

Lotus Organizer 97 GS was released for classic Mac OS in 1997 with features similar to the Windows version, including integration with Lotus Notes calendars and address books.