“Last week Apple released a security update to address the DigiNotar root certificate vulnerability, but in doing so revealed that the company may no longer support PowerPC-based Macs, at least when it comes to security updates,” Topher Kessler reports for CNET.

“Unlike previous security updates that have supported Leopard and even Tiger, Apple’s latest update requires OS X 10.6 and OS X 10.7, and this means that users running OS X 10.5 will not be able to update their systems,” Kessler reports. “If you have an early Intel-based Mac that is running Tiger or Leopard, then the only way to ensure you can update it is to upgrade your system at least to Snow Leopard.”

Kessler reports, “Apple stopped supplying OS updates for PowerPC-based systems with the OS X 10.5.8 update, but this is the first time that Apple has no longer supported them with security fixes.”

Read more in the full article here.