In the past few years, the enterprise computing landscape has changed dramatically. Virtualization, outsourcing, SaaS, and cloud computing are creating fundamental changes, and ushering in an era in which enterprises distribute increasingly critical IT assets and applications across multiple service providers. These changes are rendering legacy monitoring tools, which have their roots in the computing environments of a decade or more ago, virtually useless. This paper explores today’s computing trends and their monitoring implications in detail. In addition, it reveals how a new monitoring paradigm, the Nimsoft Unifi ed Monitoring™ architecture, uniquely addresses the monitoring realities of today’s and tomorrow’s enterprises—whether they rely on internal platforms, external service providers, or a combination of both.