I have used computers since 1986, built computers since 1991, and done tech support freelance starting in 1994. Professionally I worked 4 years in the Air Force as a Network Administrator specializing in Firewalls and Proxies. After (and currently) I work as a Network Administrator as a contractor.
My primary areas of expertise are:
Sidewinder Firewalls (v 5, g2, 7)
Bluecoat Proxy servers
Microsoft applications:
Exchange (2000,2003,2007)
Windows (3.1, 3.11, NT 3.51, NT 4, 2000, XP (x86, x64), Server 2003, 7)
Office (2000, XP, 2003, 2007)
Symantec products:
Anti-Virus (managed/unmanaged) (v8, 9, 10, 11)
Backup Exec (8,9,10,11d)
and random other products that are more than too many to list.