I would like to advocate in favor of continued support for OS X 10.4. We use the boost libraries to develop tools that our customers use to develop products for end users. We develop for both Mac and Windows, and we have hundreds of thousands of end users who use Macs. Our customers tell us that continued 10.4 support is still required. As with others, I have no hard numbers, but I know what our customers tell us they need.

Customers *always* say this, because it doesn't cost them anything extra even though it increases your development/support costs.

So if you want numbers, charge your customers extra if they want to keep using a sufficiently old system. :-) Another way is to ship the software for 10.4 as a separate product and see how many people download/buy it.

Even Firefox 4 is dropping support for 10.4. Unless someone is volunteering to take on the burden of supporting it specifically, IMHO I think we we should drop it.

Note: besides outdated hardware, 10.4 is the last system which supported the OS 9 emulator.