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My Outlook.com calendar won't sync in Outlook on Windows
To ensure that your calendars and email sync correctly, make sure that your Outlook.com account has been reconnected to Outlook for Windows. See Reconnect Outlook 2016 or Outlook 2013 to Outlook.com for uninterrupted email access for detailed instructions.
I can't edit a shared Outlook.com calendar in Outlook on Windows
Even if you've reconnected your Outlook.com account to Outlook on Windows, you cannot edit calendars shared with you if you're using Outlook on Windows. We're working on making shared calendars editable in Outlook 2016 for Windows and Outlook 2016 for Mac in future updates.