GAL Objects are directly viewable in the Exchange Management Console/Shell and OWA and Microsoft Outlook BUT ONLY IN ONLINE MODE – The GAL will only present objects that have AD Attributes beginning with ms EXCH* (and some others) populated that it uses to filter on.If these attributes are present, then the AD Objects that are Mail-Enabled or Mailbox-Enabled will appear in the GAL – and ultimately the Offline Address Book.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. How states that the reduction is gained because “”.These reports certainly match with my experience, so I was even more impressed at Microsoft’s achievement.
The new OST was much smaller than the older version used by Outlook 2010, a fact that seemed to be a good thing at the time even if the creation of OSTs en masse might generate a resource consumption problem for servers if you deployed Outlook 2013 to multiple users at one time.As a result, you’ll be reading these folders directly from the Exchange Server, so you will experience delays as the mail is being accessed and downloaded. The “Mail to keep offline” slider in Office 2016 also affects shared folders. You can set the slider to cache a shorter period of time and thus reduce the size of your offline cache.Outlook 2013 – Steps to decrease shared folder impact.As an owner, however, you can at least help the users to whom you’ve granted folder access permissions.Check out this knowledge base article I found in the West Virginia University knowledge base.