I have experience in deploying and maintaining of:
Server Operating Systems:
Windows Server 2008 to 2016, Exchange 2010 to 2019, Debian, RHEL, CentOS, Ubuntu Server.
Web servers:
IIS, APACHE, NGINX
Mail servers:
POSTFIX, EXIM, MS Exchange 2000-2016, Kerio, Mdeamon, SmarterMail
Database servers:
MySQL, MS SQL
Virtualization:
MS Hyper-V, VMware Server, VirtualBox.
Directory service:
Active Directory, OpenLDAP.
File servers:
IIS FTP, proftpd, FileZilla FTP Server, SAMBA.
Firewalls:
Windows firewall,ISA/ Forefront TMG, MikroTik, PFSense and other Routers;
Hosting Panels: PLESK,cPanel, ISPConfig, Website Panel
VOIP:
Kerio Operator, Elastix, Asterisks