I will be doing an upgrade for Cisco Unity 5.x from Exchange 2003 to Exchange 2007. I will be following this guide http://www.cisco.com/en/US/docs/voice_ip_comm/unity/5x/upgrade/guide/ex/5xcuruge130.html#wp1359133. Could someone please tell me what are the prerequisites for this upgrade i.e. what accounts, passwords I would need to hand, what needs to be done on Exchange 2007 server?
Also, is it possible to migrate the voicemails from old exchange 2003 partner server to the new exchange 2007?