When you import a calendar into  as an  file, you get a static calendar that doesn't update until you manually import a new version of the ICS file. However, if the owner of the calendar has published the ICS file online, you can subscribe to the online calendar, known as an . This means that the events you see in the calendar are updated whenever the owner of the iCal makes changes, so that you always have an up-to-date version of the iCal.
Ko v  uvozite koledar kot datoteko , dobite statični koledar, ki se ne posodablja, dokler ročno ne uvozite nove različice datoteke ICS.  Toda če je lastnik koledarja objavil datoteko ICS v spletu, se lahko naročite na spletni koledar, ki se imenuje . To pomeni, da so dogodki, ki jih vidite v koledarju, posodobljeni vsakič, ko lastnik koledarja iCal naredi spremembe, tako da imate vedno posodobljeno različico koledarja iCal.