In April 2001, there were 17 million PDAs and only 100,000 ebook
readers worldwide, according to a Seybold Report. 13,2 million PDAs
were sold in 2001. Palm was the leader, despite fierce competition,
with 23 million Palm Pilots sold between 1996 and 2002. In 2002, 36.8%
of all PDAs were Palm Pilots. The Palm Pilot's main competitor was
Microsoft's Pocket PC. The main platforms were Palm OS (for 55% PDAs)
and Pocket PC (for 25,7% PDAs). In 2004, prices began to drop. The
leaders were the PDAs of Palm, Sony, and Hewlett-Packard, followed by
Handspring, Toshiba, and Casio. Smartphones became more and more
popular then, and the sales of PDAs began to drop. Sony stopped selling
PDAs in February 2005.