I have a vast experience in system administration.
I have worked many years administering servers and computers in Windows Server Active Directory.
I have experience with:
Hardware and software support of servers
Exchange 2010 support
Nagios monitoring of servers and services
Disaster recovery and backups
Group Policy editing and settings
VBscripting, cmd/bat batch scripts
MySql, MsSQL and Oracle Database administering
and many more not listed here…