If you can see the appointments in your shared calendars online then the issue is more than likely due to the cache on your Outlook needing refreshing, here are the steps to fix the problem: Please note.If you are not sure that you are using hosted exchange please do not follow these steps as incorrectly deleting the Outlook data file may delete your Outlook email permanently. Basic free/busy time viewing is only viewable via the Outlook 2011 Scheduling Assistant feature, or via OWA.
But on some calendars where the Properties are set to User = Default, Role = Free/Busy, time, subject, location (i.e.
The person who sent you the invitation will need to remove your permissions and then send a new invitation.
If you've been granted permissions to edit a calendar, you won't be able to edit or add items immediately after accepting.
The longer the refresh rate, the less up-to-date your calendar will be.
If you are making use of shared calendars in Outlook 2016 you may find that not all appointments are showing in the calendar or are disappearing.