Calendar sync issues

I have an SBS 2011 server running exchange 2010. I have multiple users using outlook calendar to reserve a conference room. When one user reserves a time, another user goes in and reserves it at the same time. They should be getting a conflict message, but we are not. The users are using various versions of outlook (2003,2007,2010,2013).

Any assistance in configuring the calendar to throw a conflict message when the calendar is double booked would be of great assistance.
realtimerAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
Does this happen for all resource mailboxes?

I would recommend running the following command below to check the status of Allowing Conflicts
Get-MailboxCalendarStatistics -Identity resource1 | fl

Also check what the AutomateProcessing is set to as well.

If this is not set properly you can set it back to false using the following command.
Set-MailboxCalendarStatistics -Identity resource1 -AllowConflicts $false

If this does not work you might want to create a new resource mailbox and test again.

Will.
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realtimerAuthor Commented:
OK.  Thanks.  I will investigate.
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realtimerAuthor Commented:
Hi guys - this was the link to the appropriate solution.

https://technet.microsoft.com/en-us/library/bb124952(v=exchg.141).aspx

Thanks.
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realtimerAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for realtimer's comment #a40711538

for the following reason:

My finding was more valid and concise.
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