We're doing our dual swing migration from Exchange 2003 to 2013. The (intermediate/temporary) Exchange 2010 box was set up and had all the mailboxes and public folders (which we do not even use) migrated to it last weekend (we only have 25 mailboxes), and everything seems fine. How long do I need to keep the Exchange 2003 box alive? I'd like to decommission it, so that we can start on the Exchange 2013 prep, so we can get this project completed. Thanks for any information!