New Domain & Dynamic URL Redirect

[brc2]

I recently changed my site's domain and forum software. After making the switch, I setup a 301 redirect for the old domain to redirect all traffic to the new domain's 'home' page beause the posts, threads, category,...ids did not match exactly.

.htaccess
RewriteEngine ON
RewriteRule (.*) http://www.newdomainanme.com/ [R=301,L]

This works well, except when SEs attempt to spider old indexes (specifically MSN), they append the dynamic part of the address to the new domains name. For example...

Old Domain SE Listing
www.olddomain.com/phpbb/viewtopic.php?t=1522
or
www.example.com/phpbb/viewtopic.php?t=955&view=previous

How MSN reindexes after 301
www.newdomain.com?t=1522
www.newdomain.com?t=955&view=previous

The new domain links with the appended extension work and take you to the home page, but is their a price to be paid later? MSN has over 200 listings for my new domain in one week, however over 100 of them are to the home page with the old dynamic address extension. I have over 5,000 pages indexed on MSN, will this continue for all of the pages previously indexed? Is there something I can add to my .htaccess file to help correct this?

Thanks,
BRC@

[edited by: jdMorgan at 9:10 pm (utc) on June 16, 2005]
[edit reason] example.com [/edit]