Keep in mind you have to migrate the database over as well. The "www" is just a common root folder for web servers. Some use "www", some use "public_html", etc. I am going to possibly need to do this as well so I would be interested in know how to migrate a MySQL database. Don't know if this is the right forum for finding that out though.

Yes, I have copied the DB over already. I have also made the root directories identical. The config/site.php file settings were changed accordingly. However, I did forget to disable cache and pretty URLs before re-pointing DNS to new host. I get a message like this: "Warning: Cannot modify header information - headers already sent by (output started at /home/content/81/7532281/html/index.php:14) in /home/content/81/7532281/html/concrete/startup/url_check.php on line 6"

And I'm stuck.

go to site.com/index.php/dashboard and disable pretty urls

then delete the .htaccess file and you can then re-enable them

Is the dashboard hosted elsewhere or is it contained in the content when installed at a hosting provider? The reason I ask is because shouldn't a backup of content be taken after pretty URLs are disabled if it is all contained in my content?

Now this is what I get:
Warning: ini_set() [function.ini-set]: A session is active. You cannot change the session module's ini settings at this time in /home/content/81/7532281/html/concrete/startup/session.php on line 5

Warning: Cannot modify header information - headers already sent by (output started at /home/content/81/7532281/html/index.php:14) in /home/content/81/7532281/html/concrete/libraries/view.php on line 725