Hamish Barwick, for PCWorld:
Apple removed the previous statement “It doesn’t get PC viruses” and replaced it with “It’s built to be safe,” and “Safeguard your data. By doing nothing” with “Safety. Built in.” A comparison of the old and new messages is currently available here.
I always found it risky for Apple to make such a bold claim, especially because it was never true. Malware on the Mac is (extremely) rare, but it does happen.