This is an old revision of the document!
These instructions are for configuring a new Calendar account on iOS for iPhone, iPad and iPod Touch. The version of iOS used for these instructions is iOS v6.0, but they will probably work or help with other versions of iOS.
You need VPOP3 v6.0 or later for this to work. Note that a known issue in VPOP3 v6.3 may cause authentication problems - this should be fixed in VPOP3 v6.4.