The PureMessage administrators group (previously, by default, called PMX_ADMIN group) is set up automatically during installation. You can add users to it manually.
What to do
In 'Active Directory Users and Computers'
- open the PureMessage administrators group
- select 'Members'
- add the desired users.
- You must log off and log on again to make it available.
For details, see the PureMessage for Microsoft Exchange user manual.