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.
However sometimes in large complex organisations we have a situation where a new joiner joins and their colleagues want to email them immediately, but they don’t appear in Outlook for them so they call the Helpdesk “Why isn’t Joe Bloggs in the GAL??
” Well, the truth of the matter is that our new joiner Joe is in fact , an update to the Address Book won’t become available to the user until about 48 hours after the change.
The smaller OST has persisted since and, as I write, it’s about 600MB smaller than the Outlook 2010 version.
Such a wonderful reduction warranted further investigation, so off I went to find out.
https://wvu.teamdynamix.com/TDClient/KB/Article Det? ID=15142 Shared Mailbox Accounts and Their Effect on Outlook's Offline Cache Shared Mailbox accounts have the potential to greatly impact the size and performance of a user's offline cache file in the Outlook client.
This article includes recommendations as to how to minimize this impact.(This could take several minutes) Step 2: Uncheck the box next to Download changes since last Send/Receive.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.The “Mail to keep offline” slider does not affect shared folders in Outlook 2013 (and older versions).If you are the “owner” of a Shared Mailbox account, your best recourse is to turn off “Download shared folders,” as explained above or upgrade to Outlook 2016.Step 3: The new version of the GAL will now be downloaded.