Is it possible to convert existing Exchange 2003 'resources' to Exchange 2007 room w/o losing the ability to modify previous appointments?

So we have a situation where we have 2003 resources that we would like to convert to exchange 2007 rooms.  I've tested the command 'Set-Mailbox alias -Type Room' and it converts it quite nicely.  However, the issue is you cannot modify any of the existing appointments.  When you try, it says you don't have the necessary access to preform that request (something like that). After searching around, it appears that you get that because the account is disabled.  Does anyone know of a way to convert the already scheduled appointments so that they can be modified by the appropriate party?

Thanks!
cbcctsAsked:
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SubsunCommented:
Did you configure the MailboxCalendarSettings?
Set-MailboxCalendarSettings -Identity -AutomateProcessing AutoAccept
http://technet.microsoft.com/en-us/library/bb232195.aspx 

If it is already done then Run Get-MailboxCalendarSettings command and provide the result..
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cbcctsAuthor Commented:
Sorry for the late delay, the issue that the previous appointments cannot be edited by the author of those appointments.  All new appointments work correctly.  The author can edit/change all new ones, but the appointments that were converted over cannot be changed.  They get an error saying they do not have permissions to change the appointment.  I thought I read somewhere it had to do with the account being disabled, and was wondering if there was a way to avoid that?

Thanks again,

-mjg
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