References:
Mayor Companys I was working for:
Norsk-Data, ICL, Sorbus, NEC, IBM, Eurocard Zurich, West-LB, D2 Vodaphone, Comverse, The Metoffice...
Smaller but even also important Companies I helped in the past:
Zell Air Company, TRW, RZ Hartmann,
Windows -- all OS starting from 3.11 - XP incl. Servers
Unix: AIX, Linux, HP-UX, Super-UX
DB's
Mysql, MS-SQL, MS Access
Network:
Wifi Wireless Lan, Gb Ethernet, Router, Bridges, ISDN, RAS, Voip,
VPN, Fibre Channel networks (FC)
Server:
Unix Mailserver (Sendmail) MS Mailserver (Mercury)
Administration for Networks and entire Systems
incl. Workstations, Servers, Infrastructure and backups.
1. - 3rd level User Support
Hardware Services:
IBM: AS400 (I-series), Mainframes, PS2. Intel/AMD Servers, Compaq, HP,
Raid systems, FC infrastructure and switches. IBM Mainframes, Printers.
Administration Services
Network Trouble Shooting
Network Hardware Supply
Network Design
Wireless Specialists
Computer Sales & Service
Corporate Networking
Custom Computers
Internet Connections
Web Development
Cabling/Electrical Services
Security Specialists
Backups
Mailservers
Webservers
Phone via Internet (Voip)
Database Services 
My education:
