You can find 2 Type of Managed Services.
Type1
Hosting domains
Enabling web users
Mail settings
Account creation
Adding a new domain/ sub domain.
Control panel/FTP password reset.
Mail related issues (Pop3, smtp, webmail).
Web statistics support.
FrontPage/database troubleshooting.
Protected directories (SSL. Non-SSL)
Webuser accounts creation.
Check diskquota, Traffic limit and many more.
Protecting web sites (.htaccess)
Etc...
Type2
Performance tuning of servers
Automated tasks
Network/Bandwidth monitoring
Software installation
Server monitoring
Backup/Restore
Adminisration of database server
Setting up SSL support
Setting up Mailserver
Setting up DNS
Installation and Configuration of Third Party Softwares
Installing & Implementing Firewalls
Regards,
Saadi