The functionality we expect out of our devices has slowly moved up the stack, from physical components to software: and though software doesn't "wear out" the way that the platter of a hard drive can, its usefulness can decline in a way very similar to a physical component. Joe Kelly, founder and CEO of Legal Workspace, a provider of cloud-based solutions for law firms, points to firewalls as an important case. "Many consumers or companies may get lax around firewall upkeep, thinking that once they have deployed it, they are covered. But if they are not regularly patched, then vulnerabilities will develop." The physical hardware itself may be humming along nicely, but "the firewall software is the main source of decay."