Main reasons for problems
  1. Logging not enabled (bottom right hand side of the gcadmin console) so the problem goes by unnoticed.
  2. The gcadmin account password expired. (due to the 30 day password chance policy) or simply has a typo in the gcadmin console.
  3. Typo in the email address of a user in the users list on the right hand side of the admin console.
  4. EGC-service runs under local system account. This account often has no internet access and the software is unable to verify the license.
  5. Users don't have Author permissions on the group calendars public folder permissions. Resulting in duplicate items or no items at all from that user in the group calendar.
  6. (not often) The exchange server certificate expired or (no longer) has the correct servers listed.
How can I display the Group Calendar Public Folders on my Iphone, Ipad, Android device, Sharepoint or Joomla website?
How to use the Master Category List so we see category colors in the Free/Busy viewer
Gcadmin console credentials check error. ("impersonation" error or "The Autodiscover service couldn't be located” error)
Log file error: There was a problem connecting to the license server. Please make sure your firewall allows for connections to licmax.com
Log file error: Impersonation error for user abc@def,com : Invalid URI: The hostname could not be parsed.
Log file error: Problem while trying to delete replica items: Object variable or With block variable not set.
EGC-Service refuses to start after fresh install or update.
How to remove throttling for the gcadmin account
How to change the user names in the group calendar items (shorter names)
How to set an item as private on a mobile device if there is no option for it
How to schedule an import/refresh that runs at night.
How to override the standard behavior to restart the service after 100 errors
How to make public folder calendars visible in OWA 2013.
Log file error: Exchange Web Services are not currently available for this request because none of the Client Access Servers in the destination site could process the request. (Specific to exchange 2013 and office 365.)
Meetings or appointments in the group calendars that have no indication of the user name in braquets in front of the subject. You may also notice that some meetings have multiple entries while other meeting items are correct and have all attendee names in just one item.
Notify users that they should not create appointment items directly in the group calendar using a macro