I am new to Linux and I am toying around with the web services and mail services. I am trying to start the pop3 services and cannot choose pop3 because xinetd is not enabled. Can anyone please help.

Are you sure? Xinitd initializes the x-server (graphics and so on). Please describe your problem. Do you wan't to connect to a running pop3 server, or you even want to set up one for yourself ?
Are the other web services (http, ftp...) available. Is name resolving working (try a name like google.com) ?

xinetd controls things like telnet, FTP....you can see the services controlled by xinetd under /etc/xinetd.d . To check the status of xinetd.....use "service xinetd status" (Red Hat). If it is stopped use "service xinetd start"

The options you both described are grayed out, I cannot choose ftp, http, or so on. I have used the command "service xinetd start" It is saying that the service is started but not enabled. We are trying to see how we can host our own website and host our own email....internal for our company and internet mail. Thanks

Don't know where you are seeing grayed out options. I am not familiar with the linux GUIs. But from the command prompt, I would go to your /etc/xinetd.conf file and make sure it doesn't have anything in there saying disable. Then go under /etc/xinetd.d/ and edit all the service files that you want to be controlled by xinetd. There should be one by the name of /etc/xinetd.d/ipop3, make sure it is enabled. Then do a "service xinetd restart". BTW if you are going to be setting up an email server...This is done through the "sendmail" service and these options are configured in the /etc/sendmail.cf file. Sendmail and POP is pretty complex and I would recommend getting a book, or finding a good site on the net for it. Good luck! Oh by the way "httpd" which controls apache is a service on its own as well, an easy way to find out what is running is "service --status-all"...(my linux experience is mostly limited to red hat, so some things may be different)