[wilsonng]

I am thinking that OmniPresence is the rebranding of the current Omni Sync Server option we have now.

It sounds like Mountain Lion users will have the option of hosting their own sync server.

OF1 users will have to stay with Omnigroup's hosted sync server.

The other option is to have your own Mountain Lion capable Mac running Mountain Lion and hosting your own sync server with OF2. Then your pre-Mountain Lion Mac and your iOS devices can sync to this private sync server.