Networks 

Microsoft Windows 2003, Active Directory design, Domain Name Services, Windows NT 4.0, Novell Netware 5.x/4.x/3.x

E-Mail 

Microsoft Exchange Server v.5.x/2000/3, Novell GroupWise v.4.x/5.x, Microsoft Mail, Internet gateways

Security Testing

Extensive array of tools on both NT and Linux for testing system vulnerabilities

Antivirus

Symantec Corporate Edition, McAffee, Trend Micro

Firewalls

SonicWALL XPRS, DMX, PRO, Watchguard Firebox II

Desktops

Microsoft Windows XP, Professional, NT, 95/98/ME, Workgroups, and Windows 3.x

Miscellaneous

Symantec Backup Exec, Microsoft Systems Management Server

ENS engineering certifications include Microsoft Certified Systems Engineers (MCSE) studying Windows 2000, Exchange 2000, Active Directory design, Windows 95/98/ME, Windows Professional, NT Workstation and Server, MS Mail, and TCP/IP and Certified NetWare Engineer (CNE) from Novell studying NetWare 3.x, 4.x, 5.x and GroupWise