Leading leasing company in Czech republic that is a member of a strong Central European financial group contacted Extend IT with a requirement to consolidate the Active Directory due to the ongoing transformation of server virtualization combined with a request to ensure safe access to the Exchange 2003 cluster server from the Internet resulted into proposal for new AD architecture. After an analysis and consideration of the risks to the Exchange organization in the DMZ we implemented new secure front-end Exchange server that allows mobile users to access data and thus increases their efficiency and flexibility work. Extend IT also provided expert consultation services associated with application interface transitions from Microsoft Windows 2003 to Windows 2008 servers. The successful implementation finally meet all client's needs.