By adding the optional PDS card to low cost Macintosh computers, it provided backwards compatibility with the vast Apple II software library of over 10,000 titles. However, by that period Apple was looking to phase out the Apple II line, and so introduced the Apple IIe Card as a means to transition Apple II educators (and to a smaller degree, home and small business users) by migrating them over to the Macintosh. Well into the 1990's, most schools still had a substantial investment in Apple II computers and software in their classrooms and labs.
