I have resource mailboxes in Exchange 2007 (roughly around 50) which are currently of type user. I need to convert them to Room mailboxes. I need to know how can I allow only the users which have explicit permission given in the Calendar properties of these mailboxes only to schedule meeting with these resource rooms and able to retain the ability which they have got through Calendar permissions (like - Author, Editor etc). For example: If I convert a mailbox "A" of type User to Room, and set the value of automateprocessing to auto accept, every one can now schedule a meeting with this resource room. How can I make only those who got explicit permission in the calendar properties of this mailbox to have ability to book meeting with this resource ? Also, Is there a powershell way to get the Resource room Calendar permission details and also how to modify it for bulk mailboxes, like adding/ removing list of users with the permission Author, view Free-busy info etc to list of resource mailboxes..

We can use Set-MailboxCalendarSettings to allow the users who have the permission to schedule the meeting in the resources mailbox. However, per my testing on the lab, such task cant be accomplished in the exchange 2007 natively, Ill research further on it To get the permissions of Calendar folder can be accomplished in the exchange 2010 (Get-MailboxFolderPermission), we may use PFDavAdmin tool to retrieve these info in the exchange 2007 a. Download PFDavAdmin on a workstation b. Launch tool [Install NET Framework 1.1 at first] c. Please follow the step 1-4 in this article to prepare the tool d. Highlight the root Mailboxes e. Go to Tools menu, click Custom Bulk Operation f. In the jumped window, click Add button in the Operations field->Select Operation Type as Folder Permissions g. In the jumped window, select Export in the Action field. At the bottom of the window, set the filter to export the permission for Calendar folder only (0x3001001E=Calendar) About the free/busy information modification, please see my post in this thread

After further testing, I think it cant be accomplished in the exchange 2007 natively. You can try to use script, which may work for the settings. The question about script can be asked in the Development Forum

At present in order to restrict the ability of auto booking a resource room only to the users who are having permission on Resorce Claendar folder, I need to configure "BookinPolicy" and manually enter the email addresses of these users in order for them to be able to schedule meeting resource with this Room. Now, for administrator, it becomes difficult task when the meeting room is migrated to Exchange 2007 Resource room, as now if we leave the defualt auto accept setting then every one can schedule a meeting with this room. If one need to restrict this, he ends up manually entering the emails addresses for all the users in BookinPolicy and the ResourceCalendarFolder permission has no effect on this. This should have been opposite. The Bookinpolicy should get enabled when a meeting resource is converted to Room and all the users who have permission on Room's calendar folder, the name of them should get populated in the BookinPolicy List. But, this is not the case at present.:-( Any Way, Thanks a lot for your help on this.