Do you have an Intel Mac running Mac OS X 10.4, and you just bought a new iOS device? If so, you’ve probably noticed you can’t sync that new iPad, iPod, or iPhone to Mac OS X… but don’t despair, try calling AppleCare Support (1-800-275-2273) and you might be eligible for a free upgrade from Mac OS X 10.4 Tiger to Mac OS X 10.5 Leopard.

While this isn’t widely confirmed yet, TUAW is reporting that one of their readers received a free update to Leopard from Tiger courtesy of Apple:

if you find yourself …with a new iOS device that requires Leopard/iTunes 10 for sync support, but still running Tiger on your Intel Mac… call AppleCare. He says that Apple’s support team will ask you for your iPhone/iPad/iPod touch serial number… and then send you a copy of Mac OS X 10.5 Leopard, free of charge.

The reason for the free upgrade is simple: new iOS devices require iTunes 10 to sync to a Mac, but iTunes 10 requires at least Mac OS X 10.5 in order to run.

Now, on a related note… you can upgrade directly from Mac OS X 10.4 to Mac OS X 10.6 using a Snow Leopard installation DVD, these sell for $29 on Amazon with free shipping .

My opinion is that 10.6 Snow Leopard is a far superior Operating System to Leopard, so I think if you’re still on 10.4 it’s well worth the $29. On the other hand, it’s hard to argue with the price of free so if the free 10.5 Leopard upgrades continue to be offered by Apple, you might as well take advantage of that too.