Collaborative services can export events as .ics files, in iCal format. The Export command is available when one calendar or event is selected, or when a calendar or event is open. You can export an individual event or an entire calendar.
When an event is imported, its properties are handled in one of these ways:
Use. If a property is supported, then it is used as follows:
no change. Keep the original value if it is supported. For example: Duration.
reformat. Reformat a value with an equivalent. For example, a start time can be expressed in more than one time zone.
convert. Convert an overly complex or unsupported value. For example, seconds are removed from times, and durations.
Move. If a property is not supported, but a similar property is, the value of the former is moved to the latter. For example, a comment is moved, and combined with a description.
Cache. If a property is not supported, but its presence is harmless, the property is retained in case the event is exported. For example: Free/Busy.
Discard. If a property conflicts with collaborative services’s object model, it is discarded. For example: Attachments.
Importing an event that was previously exported updates the original event if the exported event was changed prior to being re-imported.