This may seem like an odd question, and it may be a non-issue. We currently have an AD environment that is still running in mixed mode due to some very old Linux/Samba servers which required it. We have recently taken all of those old servers out of service, so we can now upgrade to native mode in AD. This has the benefit of finally allowing us to start using Windows 2008 DCs. (2008 doesn't support mixed mode, so we're currently still stuck with 2003 DCs.)
What's stopping me is that we have many applications and devices (firewalls, routers, etc) which are extensively using Active Directory's ldap functionality for authentication and authorization. Since an AD mode upgrade is a one-way operation (can't be undone), I need to be absolutely sure there is no change in ldap functionality between mixed and native modes in AD. Can any confirm or deny any differences in ldap between the two AD functional modes?