There is a department that shows a calendar in Outlook under "My Calendars" called "Conference_Room PW" and I'm trying to find out where it is located.  When I hover over it, it shows "Exchange Server". But when I look on the server in EAC under Public Folders/Public Folders or Recipients/Resource it isn't there. 

How can I find out where it is lo

Look in the Outlook profile.

I did look in the Outlook profile on two different PC's and that is where it showed the "Conference_Room PW From Microsoft Exchange Server" when I hover over it.  Any other idea?

Where do you see it in the profile?

Oops, shouldn't have said "Profile", sorry! 

As one of the users I opened Outlook, went to Calendars and it shows as one of the calendars under the "My Calendars" topic.

Okay, look in the profile.

I looked in the profile; there is an additional mailbox that opens for one of the users but nothing that points me to "Conference_Room PW".

If it's there and you can open it, then it's a mailbox.

Get-Mailbox "Conference_Room PW"

Oh man... I didn't expect it to be a actual "Mailbox".  Sure enough it was! 

This mailbox was setup in Exchange 5.5, believe it or not.  We don't set them up like that anymore.  In fact I think it is the only one.

Mystery solved.  Thanks for pointing out "then it's a mailbox".

I appreciate all your knowledge, Ed. :)

You're welcome.  Happy to have helped.