When we hosted our Exchange Content locally, User's were able to add Shared Contacts to their Contacts tab in Outlook, do the same for Shared Calendars, etc. This prevented them from having to go through the Public Folders list all the time. During the migration from our local set-up to the Office365 Cloud, many of the accounts retained these shared items, and appeared to work, as though they managed to find the information in the Cloud automatically. Over-time though User's started mentioning that these items had disappeared from their Contacts, or Calendars, tab of Outlook, and that when they tried to select Open a Shared Contact/Calendar they got the message that stated they did not have the permissions to perform this action. If they went directly to the Public Folders section of Outlook and opened the same Content, they cold view it without issue, but again not add it. From what we can see, they should have all the permissions required to perform these actions, so we aren't sure what has happened.
We would appreciate any help that you can give us with this. Thank you.