As with many operating systems, Snow Leopard users could receive security updates, but had to manually approve and install them. Not the case with its feline counterpart. In Mac OS X Lion, all security updates are going to be automatic for the user, ostensibly occurring silently behind the scenes.
However, security experts have expressed some doubt as to how effective the automatic or updates will be when dealing with compatibility issues.
“We will have to see how well this works as ‘automatic’ or ‘unmanaged’ update may of course break incompatible applications,” said SANS Institute researcher Johannes Ulrich, in a blog post.