Problem 1

When someone adds an all day event to the calendar, when looking at the published web view it will repeat the same all day event multiple times within the same day.

Problem 2

When someone tries to subscribe to a calendar it appears to be hit and miss even with the GW8 client. It will tell you that it is missing an "Invalid Parameter" even though Google Calendar or Apple iCal will subscribe just fine.

Problem 3

If you have a reoccurring appointment set, when someone subscribes to that calendar, only the very last appointment will show to the subscriber.

Problem 4

When publishing the ICS, all the appointments appear in the ICS but the ICS apparently has a non standard syntax as all day events are not imported correctly and many reoccurring appointments are skipped.

This IS a problem.