I have MS Exchange 2007 running on the server with clients connecting up mainly through Outlook 2003. Exchange 2003 mailboxes were moved over to the 2007 mailbox. Exchange 2003 has been uninstalled and exists no more. AD does not show the old Exchange 2003 server as having any roles aside from global catalog. Public folders are setup on the 2007 box. Previously existing users free/busy data shows up correctly without any problems. New mailboxes (user, equipment, room, etc..) are not showing free/busy data. I've downloaded PFDAVAdmin but it does not want to show me anything on either mailboxes, public folders, or system folders because 'name cannot begin with the '0' character'. I have no clue what it's talking about and the only help I found was to try it on a different machine than the server... which I have, and still get the same error message. So no help there. I've compared the permissions in Active Directory from a working account to a new, non-working account and they are identical. Still not working... I've compared the permissions/settingsusing Exchange Management Shell from MailboxCalendarSettings to ADPermissions and anything else I could find. I've setup the same settings on the new as the old had... still not working. I've opened the mailbox in Outlook 2003 (and in 2007 just in case it had to be Outlook 2007) and setup permissions for Default to Reviewer. I even gave anonymous Reviewer permissions on both the mailbox and the calendar... still not working. Add-MailboxPermisson -identity NewNotWorking -AccessRightsFullAccess -User Me let's me open the calendar, but I still can't get free/busy data for scheduling. And I've rebooted, waited 24 hours for Exchange to work it's magic, etc... I'm still stumped. Any ideas, suggestions, comments, requests for more information, etc.. would be greatly appreciated. :-) Thanks in advance, John V.

Talk about blind luck.... I had a user schedule a meeting (without seeing the Free/Busy data) for one of the resouces I was having problems with. AutoAccept was turned on for it. As soon as it accepted the meeting, the Free/Busy data started showing up in Outlook. I went through and created a bogus meeting for midnight for all of the mailboxes I needed and they all worked. So, I had to re-enable the account in AD, login to it with Outlook, share out the calendar, set up delegates, etc.. close it down, turn AutoAccept invites on, send bogus meeting, turn it back to AutoUpdate, and then disable the account in AD for every mailbox.. (until my org moves up to Outlook 2k7).. Hope this helps someone else. :-) John

Many thanks John for posting this, Deadset your solution absolutely worked. this has helped us resolve the same issue. :)