Hierarchical Address Book

We have a Domino 5.12 environment and are looking to upgrade to ND7. We presently have a flat address book. i.e. all objects are in the same OU. Does anyone know if a hierarchical address book is required for ND7. i.e. OU for servers, OU for Sales etc.

Subject: Hierarchical Address Book

putting servers and users in different OU’s has never been a requirement and I cannot see that it ever would be. Using different OU’s is at the admin’s discretion.