Making links work regardless of .com or .org

If you are on a Microsoft server someone will be along shortly, maybe.

RewriteEngine on 
RewriteCond %{HTTP_HOST} . 
RewriteCond %{HTTP_HOST} ^(www\.)?domain-name\.com 
RewriteRule (.*) [domain-name.org...]  [R=301,L] 

(4) there is no (4). That's all.

-----
(*) Replace "domain-name" with yours, of course.
-----

Perhaps this thread is useful:

Site change of URL [webmasterworld.com]

I have writte a few detailled posts in that thread.