First, determine the extension numbers of the voice mail ports.
The system see a Partner Mail VS as a 6 port card, no matter how many ports it has. The active ports are the last two, or the last four if you have a 4-port expansion card in the PMVS.
If you only have an ACS in the center slot of the carrier, and the PMVS in the 1st slot, and the PMVS is 2 port, your Voice Mail ports are 22 and 23. (The ACS is 10-17, so the "6-port" card in slot 1 is 18-23, and the last two ports are 22 and 23)
Now at Ext. 10 or 11:
Feature 00-System Program-System Program
Assign the VM ports to Hunt Group 7:
#505-7-XX-1 (where XX is the Voice Mail Extension Port. Do this for each VM Port)
Set the Transfer Return Extension to Ext. 10:
#306-XX-10 (again, do for each VM port)
I like to remove auto privacy from VM ports, so that if you miss answering a call picked up by the Auto Attendant, you can interrupt it:
#304-XX-2
Now you PMVS should be working. To assign a VMBX to an Extension, #310-XX-1 (where XX is the Extension with a Mailbox.) In the System Administrator's mailbox, make sure that the mailbox exsists, and if not, create it.
If this is clear-as-mud, post your other questions.