Apple's not-yet-announced small business support plan, titled Joint Venture, will be offered to companies buying new Macs -- but may also be open to also supported older machines as well, a source tells The Wall Street Journal. The new service, expected to be unveiled Wednesday, will expand support for business Macs for a flat per-year charge ($500 for up to five "systems," which can include not just the computer itself but monitors and iOS devices tied to that computer -- and allow additional systems to be added to the contract for $99 per system per year.