Index: wp-admin/includes/ms.php
===================================================================
--- wp-admin/includes/ms.php	(revision 31332)
+++ wp-admin/includes/ms.php	(working copy)
@@ -253,10 +253,11 @@
 	);
 	update_option( 'adminhash', $new_admin_email );
 
-	$email_text = __( 'Dear user,
+	$email_text = __( 'Howdy ###USERNAME###,
 
 You recently requested to have the administration email address on
 your site changed.
+
 If this is correct, please click on the following link to change it:
 ###ADMIN_URL###
 
@@ -277,6 +278,7 @@
 	 * ###EMAIL###     The new email.
 	 * ###SITENAME###  The name of the site.
 	 * ###SITEURL###   The URL to the site.
+	 * ###USERNAME### The current user's username.
 	 *
 	 * @since MU
 	 *
@@ -289,6 +291,7 @@
 	$content = str_replace( '###EMAIL###', $value, $content );
 	$content = str_replace( '###SITENAME###', get_site_option( 'site_name' ), $content );
 	$content = str_replace( '###SITEURL###', network_home_url(), $content );
+	$content = str_replace( '###USERNAME###', $current_user->user_login, $content );
 
 	wp_mail( $value, sprintf( __( '[%s] New Admin Email Address' ), wp_specialchars_decode( get_option( 'blogname' ) ) ), $content );
 }
@@ -331,7 +334,7 @@
 				);
 		update_option( $current_user->ID . '_new_email', $new_user_email );
 
-		$email_text = __( 'Dear user,
+		$email_text = __( 'Howdy ###USERNAME###,
 
 You recently requested to have the email address on your account changed.
 If this is correct, please click on the following link to change it:
@@ -354,6 +357,7 @@
 		 * ###EMAIL### The new email.
 		 * ###SITENAME### The name of the site.
 		 * ###SITEURL### The URL to the site.
+		 * ###USERNAME### The current user's username.
 		 *
 		 * @since MU
 		 *
@@ -366,6 +370,7 @@
 		$content = str_replace( '###EMAIL###', $_POST['email'], $content);
 		$content = str_replace( '###SITENAME###', get_site_option( 'site_name' ), $content );
 		$content = str_replace( '###SITEURL###', network_home_url(), $content );
+		$content = str_replace( '###USERNAME###', $current_user->user_login, $content );
 
 		wp_mail( $_POST['email'], sprintf( __( '[%s] New Email Address' ), wp_specialchars_decode( get_option( 'blogname' ) ) ), $content );
 		$_POST['email'] = $current_user->user_email;