Windows Servers Systems/Services installation,configuration,administration(AD,Group Policy). Linux Servers Systems/Services installation, configuration, administration (centos,ubuntu,freebsd,etc.). Virtualization Systems configuration and administration. Backup and monitoring of Windows and *nix servers. Monitoring the high availability for Windows, *nix servers and network equipment (PRTG, NetFlow). XWiki, Jira Intranet System Development and Administration. Web Hosting Servers configuration and administration using Webmin and WebSitePanel tools. Messaging Server/Client configuration and administration(Openfire with Jitsi). Hardware and software network routers configuration and administration. Installation, Maintenance and support of Exchange Server 2013 mail server.