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OS X is the desktop operating system from Apple Inc. It was the successor to Mac OS 9 and here the 'X' means 10. OS X is based upon the NeXTSTEP/OPENSTEP OSes developed in the 1980s and 1990s by NeXT Inc., which Apple purchased in 1996.

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Calibre is a free and open source e-book library management application available. You can download from here which is available for all operating systems. Adobe Digital Editions is also one of the e …
answered Mar 24 '14 by Ritesh