Which software developed by Pito Salas was purchased by IBM in the 1990's?
Pito Salas: Pito Salas is a Curacaoan-American Cambridge, Massachusetts-based software developer. Pito Salas:  While working with Lotus' Advanced Technology Group in 1986, Salas invented the pivot table, a "next-generation" spreadsheet concept which was released by Lotus in 1989 as Lotus Improv. Lotus Software: Lotus Software (called Lotus Development Corporation before its acquisition by IBM) was an American software company based in Massachusetts. Lotus Software:  IBM purchased the company in 1995 for US$3.5 billion, primarily to acquire Lotus Notes and to establish a presence in the increasingly important client–server computing segment, which was rapidly making host-based products such as IBM's OfficeVision obsolete.
Lotus Software