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First of all the easiest way to perform the migration on the EV side is to install the new hardware then perform a data only restore. To make the restore easier on yourself keep the new servers the same names as the old ones.
Stop the EV services on the existing EV server
Install the new servers OS
If your servers are in a domain you will take the old server out of the domain, give it a temp name and then rename the new server to be the same name as the old server then join it to the domain
Install EV on the new server but do not run the config yet
Copy your data from the old server to the new server making sure the drive letters are the same as the old
Now perform the data only DR.
This will get your EV up and running
If you have more than one EV server I recommend you start with the server that is acting as your directory server
Thats step 1.
Step 2 is to move to the newer version of Exchange
Dont do all of the steps at the same time because it will cause you pain and trouble shooting any issues becomes hard as you will have issues tracking if the issues is due to the Exchange upgrade or the EV move.