Those other methods all differ based on your MT permalink setup. Try my method, which is independent:
(Note, because your MT files are in html archives, you need mod_rewrite for this, so if you don’t have that, stop reading)
First step is to make your server parse html files for PHP. Add this to your site’s .htaccess file
AddType application/x-httpd-php .html
Make this your MT individual entry template:
<?php
$wp_url = '<$MTEntryDate format="?year=%Y&monthnum=%m&day=%d&hour=%H&minute=%M&second=%S"$>';
header("HTTP/1.1 301");
header("Location: https://site.com/" . $wp_url);
exit();
?>
Rebuild your individual entries. This makes all your entries just contain this simple PHP 301 redirect that sends the browser to wordpress asking for an entry with the exact time (to the second) as the MT entry.
Put this code in WordPress to fix the URI and complete the illusion. Put it near the top, after the wp-blog-header call, but BEFORE any content is echoed:
/* Redirect Movable Type permalinks */
if($year && $monthnum && $day && $hour && $minute && $second && $posts){
foreach ($posts as $post) {
$redirect_url = get_permalink();
}
header("HTTP/1.1 301");
header("Location: $redirect_url");
exit();
}
So here’s the process: MT has generated a file with the exact time and date of the entry, with PHP code to ask WordPress for it. When the page is loaded, a 301 redirect sends it to wordpress with the date/time info. When WP sees that the time and date are specified down to the second, it realizes that there can reasonably only be one permalink for this entry. It gets the permalink that matches that time/date info, and does another 301 redirect, sending the user to the new entry.
Google will eventually catch on, and your old URIs will disappear in the search engine.
