At some point in the past, before I came to work for my company, BES Express 5.02 was installed on the company's mail server (Exchange Server 2003). A few years ago, a new Exchange Server (2007) was set up, all mailboxes and public folders were migrated to it. It looks like the former sysadmins were reluctant to decommission the old Exchange server (2003). The physical server itself is still good and can continue to run BES Express but Exchange Server 2003 is obsolete and should be uninstalled. Does BES Express require that it run on an Exchange server? If not, when I installed Exchange Server 2003 from the server that is running BES Express, is there anything that I shouldn't uninstall or need to (re)install after the Exchange Server removal in order for BES Express to continue to function normally?