lucy24 - 3:55 am on Sep 30, 2013 (gmt 0)
I think you can now go back to the first two-three posts in this thread and disregard what came later. The confusion arose because you really do have "/forums/forum" like that.
RewriteRule ^support/(.*)$ http://www.example.com/forums/$1 [R=301,L]
This is the code that should have worked and I think it's what you had all along. So if the redirect isn't taking place, there's some other and unrelated reason.