Michael,
Currently Macs cannot be managed with a Windows manager (Symantec System Center [SAV], Symantec Endpoint Protection Manager [SEP 11], Symantec Protection Center [SEP SBE 12]) . SAV for Mac (10.2.3 is not yet available) has its own management console, which must be run on a Mac server.
Come April of 2010, SEP for Mac will be released. This will allow management by a Windows server, and I believe this will be concurrent with the next release of SEP 11. I don't know about the status of SEP Small Business 12.
If you have the correct product entitlement (SAV for Mac or SEP Multi-Tier), you should be able to get the SAV for Mac disk image (.dmg).
Let me know if you have any other questions....
sandra