Customer support is a range of customer services to assist customers in making cost effective and correct use of a product. It includes assistance in planning, installation, training, trouble shooting, maintenance, upgrading, and disposal of a product. wikipedia.org

A system administrator, or sysadmin, is a person who is responsible for the upkeep, configuration, and reliable operation of computer systems; especially multi-user computers, such as servers. wikipedia.org

Customer service is the provision of service to customers before, during and after a purchase. wikipedia.org

A bug tracking system or defect tracking system is a software application that keeps track of reported software bugs in software development projects. It may be regarded as a type of issue tracking system. wikipedia.org

Windows Server is a brand name for a group of server operating systems released by Microsoft. wikipedia.org

Microsoft Exchange Server is the server side of a client_server, collaborative application product developed by Microsoft. It is part of the Microsoft Servers line of server products and is used by enterprises using Microsoft infrastructure products. wikipedia.org

The Windows Azure Platform is a Microsoft cloud platform used to build, host and scale web applications through Microsoft data centers. wikipedia.org

Active Directory (AD) is a directory service created by Microsoft for Windows domain networks. wikipedia.org

Microsoft Windows is a series of operating systems produced by Microsoft. wikipedia.org