Question: Which software developed by Pito Salas was purchased by IBM in the 1990's?
Sentence (from "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.
Relevant evidence: Yes