-If you prefer to just copy your old plugins over (if it's the same version
-or if you are lazy), you may do so. If you notice irregularities with the
-plugins under the new SquirrelMail, try installing new versions of the
-plugins.
-
- $ cp -Rp squirrelmail-1.0.6.bak/plugins/* squirrelmail-1.2.0/plugins
+You should not try replacing plugins that are already included in SquirrelMail
+package. Download latest versions of plugins that are not included in new
+SquirrelMail package or copy them from older SquirrelMail install.