Windows-2003 & Windows 2000 Servers: W2K Advance Servers and W2k3 Servers configured in a Single Forest, Multiple Domain Structure configured in different LAN Segments with different Roles like DC, ADC, and member application/mail servers. Active directory: Single Forest having one domain having domain controller and additional domain controllers in Global Catalog Controller, RID Master, PDC and Infrastructure. Antivirus: Symantec Antivirus Corporate Edition, MacAfee Group shield for Mail filtering. Backup: IBM Tivoli TSM backup solution Monitoring tool : IBM Tivoli endpoint & ABC (Automatic backup check ) Tools . Virtual technologies : VMware GSX and ESX Server environment , working in virtual environment, updating , troubleshooting & migrating thru VMware Virtual Infrastructure Client Ticket/Change & Inventory handling tools : handling clients tickets thru Ramedy & Manage Now tools Cluster Solution : providing 99.3 % Application and domain controller reliability thru Microsoft clustering Storage System : working in SAN and ISCSI network storage system environment