Preferences ==> Interface ==> Behavior.
The right side is taken up by a list of formats to "Use internal viewer for", just uncheck EPUB and calibre will open that format using whatever the OS default is (as though you double-clicked in Finder).
You can also take a look at the Open With plugin. Under Preferences ==> Advanced ==> Plugins, click the Get new plugins button (on the bottom) and install the plugin. It will add a right-click option to books which will let you use multiple opening options for each book. This is useful if you don't want to just use the OS default.
There may already an entry to open in iBooks, if not it should be easy to make one.
Last edited by eschwartz; 10-19-2014 at 07:12 PM.
|