• Analysis, redesign and documentation of corporate network.• Implementation of proper security systems and secured wireless access points.• Exchange 2003 server migration from Exchange 2000 server.• Windows 2003 server migration from Windows 2000 server.• Implementation of Windows Server Update Service across the domain.• Implementation of secure VPN connectivity between head office and branches (Netscreen VPN / OpenVPN) and automated transfer of data using file transfer protocol to branches over secured VPN.• Design and implementation of corporate intranet.• Building a heterogeneous environment using Microsoft Windows platform and Linux platform which included configuration and administration of GPL applications: • OpenLDAP, Samba server, Squid proxy server, Dansguardian content filter, VSFTPD FTP server, Send mail, Postfix, Bind 9 DNS server, NFS server, Untangle -The Open Source Network Gateway, NTP server