Which software developed by Pito Salas was purchased by IBM in the 1990's?
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.
i don't know