SAPO was created on September 4, 1995 by the Computer Science Center of the University of Aveiro. In 1997 SAPO was converted in a business and the company Navegante was created.
Later, in September 1998, Saber & Lazer - Informática e Comunicação S.A. bought SAPO from Navegante. With Saber & Lazer, SAPO launched new services; free e-mail, a virtual shopping and some new features for the search engine.
Still in that year, due to increasing traffic SAPO and Telepac signed an agreement, with 'Telepac' becoming their new internet service provider.
In September 1999, PT Multimédia acquired 74,9% of Saber e Lazer. And in March 2000, SAPO was assigned to PTM.com, with the objective of joining all internet projects under only one company.
After some improvements in infrastructures and accesses, finally in June 2002 the ADSL access service was launched, starting the era of new contents for the portal. On March 28, 2006, Sapo XL was launched: a project for broadband content, in which the main content is videos, on-line television transmission and real-time transmission of events. On September 15, 2010, Sapo launched its website in East Timor.