I have several users that want to use the same calendar and have reminders pop up for everyone, not just the owner of the calendar.  From my reading, I understand I need to create a shared mailbox in Exchange with the EMC.  I have done that.  I used the command:

New-mailbox sharedcalendar -shared -userprincipalname sharedcalendar@domain.com

Then I went into the "Manage Full Access Permission..." on the exchange server and added everyone I wanted to have access to the calendar.

When I did that, the calendar was automagically added to the users Outlook as another exchange mailbox.  There was no need to go to Data File Properties > Advanced > Advanced > Add, because the calendar account was already there in Outlook.

Here's where I'm stuck.  Calendar reminders do not pop up.  The calendar is added, I can see the event, but no reminder.

Where did I go wrong?