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In a Microsoft Exchange Server 2007 environment, consider the following scenario.
You create a room mailbox, and you enable AutoAccept for the room mailbox by running the following command in Exchange Management Shell:
Set-MailboxCalendarSettings -Identity <alias of the room mailbox> -AutomateProcessing:AutoAccept
You convert this room mailbox to a regular user mailbox by running the following command:
Set-Mailbox -Identity <alias of the room mailbox> -Type Regular
In this scenario, when messages are sent to this converted mailbox, those messages are moved to the "Deleted Items" folder, and a response is sent automatically by the user.
This problem occurs because the Set-Mailbox command does not fully change the attribute for the user. If you run the Get-MailboxCalendarSettings command against the user, you find that AutomateProcessing attribute is still set to "AutoAccept."
To resolve this problem, install Update Rollup 7 for Exchange Server 2007 Service Pack 1.
For more information about Update Rollup 7 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: