It's important to assess systems and equipment with a skeptical eye when taking over tech administration for a new site.
A site systems technology audit and assessment checklist, like the one provided by TechRepublic Premium can help make this process much easier.
From the download:
A few common challenges almost always accompany acquiring a new firm, merging with another business, or taking over IT administration for a new client or office. Whether you’re an organization integrating an acquired site, or you’re a managed services provider managing a new client location, a first task usually involves confirming the networks, systems, and platforms you’ve just inherited responsibility for administering.
Other common best practices typically include confirming the age and status of corresponding equipment and gauging the respective security posture, including patch status, for each component.