I have several resource mailboxes (rooms) that I have converted from Exchange 2000 to Exchange 2007. I have reviewed the following thread already:http://social.technet.microsoft.com/Forums/fr-FR/exchangesvradmin/thread/dd949d84-7196-4d82-b5f5-0ef971563cb2Additional steps taken: 1. I have created a new (native 2007) resource mailbox, set it to AutoAccept, and tested its ability to remove cancelled meetings, and it works fine.What I would like to know is if there is a solution to this issue, or do I have to delete the offending original resource mailboxes and recreate them?Thanks in advance.

This is whatI did when we went from 2003 to 2007. I move the mailboxes from the 2003 to 2007 servers as regular mailboxes. Then I ran the following PowerShell script to convert them to resources and set everything like it should be set. Set-Mailbox -Identity [MAILBOX NAME] -Type Room Set-MailboxCalendarsettings -Identity [MAILBOX NAME] -AutomateProcessing AutoAccept -AllowRecurringMeetings $true -DeleteNonCalendarItems $true -AllowConflicts $false

Even i try all this, done new Mailbox, use the powershell script. Ressource remain with canceled meeting in the calendar when i cancel one. The server is an Exchange 2007 Server with Rooms and Equipment Mailbox newly created on it, no conversion from 2003 Exchange server or AAA.