migration question

Our users have Thunderbird configured to search for email addressed in ldap

our old ldap has a base DN of dc=sbg,dc=com

our new ldap has a base DN of ou=people,dc=sbg,dc=com

Is there a way to provide a view or alias of the new system so clients do not have to be updated to the new base DN?

Follow-Ups:
- Re: migration question
  - From: "Pierangelo Masarati" <ando@sys-net.it>
- Re: migration question
  - From: "Gavin Henry" <ghenry@suretecsystems.com>