I am in the process of moving from a windows 2003 server to a new one running windows 2012 R2. Is there a checklist of things to follow for moving the data from the old one to the new one? Also, is there an easy way to purge the emails from the old server. the message store is getting too large.

Customers are reporting that their emails are being rejected for error 451. It looks like the logs are showing mail enable taking too long to verify if they are spammers. Subject: FWD: Warning: could not send message for past 4 hours is the message they are getting back. Any one else having issues s...