Years ago it would have been unthinkable to give up control to securing your most valuable assets. But for some companies the risk of handing the security keys to a third party is less than the idea of facing the daily barrage of attacks.
When asked why a company would cede control, many vendors said it depends on the level of staffing that company has. If the expertise is lacking, why take the chance. Or if it is a small to midsize enterprise, maybe there is just not a budget for creating a security staff up to the level needed. Therefore, partnering with a managed security services provider (MSSP) has become almost a must when faced with worries over data theft and the number of mobile devices entering the workplace.
Source: NW Security 1