When your Outlook Client connects to an Exchange 2016 server and you have one or more shared calendars within your Outlook profile, it can happen that you experience a delayed calendar content display. It looks like the calendar is loading.
This is caused by when Outlook tries several variants of autodiscover requests when establishing a connection. This can be solved by excluding time-consuming autodiscover lookups on client side.
The following 2 registry keys can be implemented to get around this behaviour :
DWORD 32 bit ExcludeHttpsRootDomain 1
DWORD 32 bit ExcludeHttpsAutoDiscoverDomain 1
Setting this key solved all issues we had users experiencing a delayed calendar content display in Outlook.
Please make sure to use the appropriate path for your Office version when navigating through the registry.
Office Versions :
2010 = 14.0
2013 = 15.0
2016 = 16.0
When setting up a new profile in Outlook and autodiscover takes ages please take a look at :