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

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

OS X, previously Mac OS X,is a series of Unix-based graphical interface operating systems developed and marketed by Apple Inc. wikipedia.org

A help desk is an information and assistance resource that troubleshoots problems with computers or similar products. Corporations often provide help desk support to their customers via a toll-free number, website and e-mail.

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

Microsoft SharePoint is a Web application platform developed by Microsoft. wikipedia.org

A computer repair technician is a person who repairs and maintains computers and servers. The technician's responsibilities may extend to include building or configuring new hardware, installing and updating software packages, and creating and maintaining computer networks. wikipedia.org

Application software is a set of one or more programs designed to carry out operations for a specific application. Application software cannot run on itself but it is dependent on system software to execute. wikipedia.org