I want to upgrade exchange from 2003 to 2010, but now i have just one server having exchange 2003 mailbox, and its just working with internal network. for receiving and sending email to outside, we have hosted mail server and we use Native POP3 to download mails from hosted server to our exchange server. and now we want to have 2 server. and also want to deploy edge transport role to send and receive mail from outside so what will be the best to upgrade to 2010 ?