Outlook 2010 - resource calendars

I recently converted our cars/rooms to resource calendars.  Everything is working great. However, all my users are using Outlook 2010 and can still directly invite the car/room from their list of shared calendars. All cars/rooms have the Default user permission set to Reviewer. I am the only user using Outlook 2013 and I do receive the error that I do not have permission to make an entry. I have tried adding the EnableDirectBooking and setting it to 0 on the user's workstation, but that doesn't work. Even if I set Default user permission to None, the user cannot read the calendar and even though they are declined they can still perform an invite. Is my only option to upgrade everyone to Outlook 2013? TIA
FayetteMHMRAsked:
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Jamie McKillopIT ManagerCommented:
Hello,

Unfortunately, you can't prevent someone using Outlook 2010 from sending an invite to a resource. You would need to upgrade everyone to Exchange 2013 to get the functionality you are looking for.

-JJ
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FayetteMHMRAuthor Commented:
That's what I thought. Thank you for confirming it.
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