Exchange 2013 using resource mailbox for sick days rejected

I recently set up resource mailboxes so our organization can start tracking vacation days.  It is working exactly the way we need it to, with each manager having their own departmental calendar.

The problem is how do we book sick days?  Obviously these aren't pre-planned so when you return to work you add it to the system.  Unfortunately when you do this the resource mailbox automatically rejects the meeting as it occurred in the past.  

Does anyone know of a way around this?  Various online searches have people suggesting a shared mailbox instead.  The problem I am finding with that is in using a shared mailbox calendar I am not getting the approval notifications I am seeing with the resource mailbox.  We need to have the manager notified and have them approve any requests before they are added to the schedule.  The resource mailbox handles this perfectly.  It just won't let us add in sick days.

How are others handling sick day booking using Outlook?
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Pete LongTechnical ConsultantCommented:
This is a limitation of a resource mailbox! The purpose of a Resource mailbox is to book a "Resource" for current or future use, such as a conference room, projector, etc Your only option is to use a 'Shared Calendar' instead. (or a SharePoint Calendar of course).

DrakeCAAuthor Commented:
But a shared calendar doesn't seem to have nearly the same functionality as a resource.  We need the manager to receive an email of the pending request, then they need to accept it.  Only then do we want it to be displayed in the calendar.  We also need the HR department copied in so they are notified when a new date has been booked.  

Is there a way to add this functionality to a shared calendar?
Pete LongTechnical ConsultantCommented:
You would probably need to setup delegate approval, but your question was I can't do 'x' with a resource mailbox, the answer is, that's correct, it's by design


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DrakeCAAuthor Commented:
Ended up using a shared mailbox but couldn't find a way to assign true delegates using PowerShell.  Ended up having to set up Outlook profiles for each shared mailbox on my PC and logging in to assign them.
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