Office 2016 shared calendar not updating
Typically this happens when running Outlook 2016 in cached mode with exchange or Office 365.
The easiest way to verify this is the problem is to log in to your Outlook Web Mail, if you are using Office 365 you can log in at https://portal.using your username and password.
Last updated: May 2, 2017 Currently, you can't use Outlook on Windows to edit calendars that are shared with your account, even if you've reconnected your account to Outlook.
We're working to make it possible to edit shared calendars in Outlook 2016 for Windows.
However, any edits you make will only be local edits—other people who share the calendar will not see your edits.
STATUS: WORKAROUND To access the calendar shared with your Office 365 for business account, you’ll need to accept the invitation from Outlook on the web .
If nothing is specified, you are in the Current Channel.
If you don’t have this section at all, you are using an MSI-based installation.
Instead, calendar syncing will only occur a couple of times per day.
We're currently investigating how to enable instant syncing in these situations.