Microsoft Office Outlook cannot import vCalendar file. Have made the switch from Lunar to Gregorian, and it still won't import. What application supports the vCalendar standard? Tried iCalShare ...
I started working with Outlook emails long ago. And I had many good or not utilities for working with emails. But one day I had similar problem, and I was born under a lucky star - I discovered an one tool, which determined my issue, probably it will relieve you also - ost to pst converter.