HiWe are running Exchange 2003 and 2007 mixed....we have dedicated Mailbox, Hub and CAS servers for the 2007 side of things.On Exchange 2003, we have our Schedule Free/Busy Public Folders held on a dedicated server.From what I understand, with Exchange 2007, the Schedule Free/Busy function is managed by the CAS server. How does this work? Do we need to do something to make the CAS 'responsible' for Free/Busy information prior to removing the Free/Busy PF's on 2003?

Much of that depends on the client version and where the mailbox lives.More Info:http://msexchangeteam.com/archive/2006/10/23/429296.aspx'What does Exchange 2007 Availability Service do"Prior to removing the 2003 servers be sure to follow the steps here:http://technet.microsoft.com/en-us/library/bb288905.aspx'How to Remove the Last Legacy Exchange Server from an Organization"