by Howard Miller.
I think there is a bit of a gap here...
Migrating what from what? LDAP is just a authentication mechanism. As long as you have your Moodle site set up properly with respect to your LDAP server then it should work.
What you do NOT want to do is to have your main admin as LDAP. Always leave that manual so you can get in when it all goes horribly wrong.
LDAP only uses MS if it's MS LDAP (i.e. Active Directory). There's more to life than Microsoft