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?