Through the use of secure data centers and cloud computing, it is much easier and more cost effective to develop a world class IT infrastructure for even the smallest accounting and tax practice. This chapter discusses four basic alternative approaches to address the server-based infrastructure today: traditional, managed service, hosting, aka IaaS (infrastructure as a service), and software as a service (SaaS). The managed service and hosting models provide for a certain level of outsourcing of the IT systems management, whereas the traditional model is all done in-house. One of the primary impediments to the adoption of cloud computing in the market place 5-10 years ago was concern about the security of information transmitted via the Internet and stored on remote web-accessible servers. Ironically, the situation has reversed as a result of greater education and awareness of security measures that can be implemented to protect the information in the cloud.