Hello There, We are in mixed Exchange 2003 SP2, and Exchange 2007 SP3 environments with multiple AGs. We have migrated all users in our first AG where the first public folder of Exchange 2003 server exists. We have installed new Exchange 2007 public folder server to replace the first public folder server (Exchange 2003). All other AGs are in Exchange 2003 SP2. For users migrated to Exchange 2007, majority of clients are still using Outlook 2003 SP2. Freebusy are very important for us. We will try to use server level replica move method per Microsoft to move all PF replica from the first Exchange 2003 Pf server to our new Exchange 2007 PF server, then retire the first Exchange 2003 PF server. Will these cause any potential issue with other AG they are still use Exchange 2003 PF servers and Exchange 2003 mailboxes, and Exchange 2007 users for freebusy availability? It seems Exchange 2007 availability services doesn't support Outlook 2003 SP2 clients, however, as long as we move replica from freebusy tree of the site from the Exchange 2003 PF system folders to Exchange 2007 PF server, that should take care of freebusy availability for Exchange 2007 users with Outlook 2003 clients. Am I right? The the exchange 2003 PF server is the first exchange PF server in our org, before migration to Exchange 2007, we usually go to the AG, ESM 2003, expand to the AG, folders - public folders ... since from there, we can manage public folder with PF hierarchy. After we retire the first Exchange 2003 PF first, will it cause any issue for the rest of Exchange 2003 PF world? Thanks in Advanced

Hi, To answer your question, you can replicate the Public Folder to the Exchange 2007 server and the Free/busy information will be published in local public folders to Outlook 2003 users which is not related to Availability Service. To avoid some unexpected situation, you can just turn off the first Exchange 2003 PF server before it is decommission. Usually, it does not cause any issue for the rest of Exchange 2003 server and its Public Folder. Meanwhile, I would like to share you the following articles which are related to Availability Service and Public Folder. http://msexchangeteam.com/archive/2006/10/23/429296.aspx http://msexchangeteam.com/archive/2006/02/20/419994.aspx Thanks. NovakPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.