We currently use OpusFlow group calendar for exchange. What it does is the people assigned to the group all of their calendar items are automatically copied to the calendar so all the people see when to schedule meetings or events.
For example we have 5 managers assigned to the group they all see each others schedules.
How do I set this up in Exchange 2013 without having a 3rd party application? We currently use Outlook 2010 on our staff computers.
Not entirely sure what you mean.
But visiting there website, noticing community forum closed and there pages are copyright 2005, I am guessing this software is no longer developed (and/or supported)?
Very good chance it wont work with Exchange 2013.
It's possible the functionality you are looking for is native to Exchange. What business goal are you trying to accomplish?