The org unit details page has three tabs...

Details

The details of all the admin users for the org unit in question. Gives all the address and contact details for each of the admin users along with values for any custom fields that have been specified.

Users 

The same information but for non admin users. This page also provides a link to user management section so org unit admin users can quickly navigate to edit other users.

Outstanding acknowledgements

Present if batch releases are enabled. Shows outstanding acknowledgements of batch releases for users of the org unit.