you have to make sure whether the fully qualified domain name of the website and its IP address is registered in the ISP's DNS Server database or not.

By the way what error messege do you get when...

Do you want to access this Server from
the local network only or from both
local network and from outside the network via internet?

Are you trying to access your computer
from a local network where this apache computer is located or trying to access
this apache computer from outside through internet?

Please correct me If I am wrong, do you
mean to say that the ISP service from which you receive internet service doesnot accept mails from the Mail Server in your local network?
Well this could be...

I am sorry I couldnot understand your question . Are you talking about user profile?

It depends ,the WAN IP address doesnot generally vary but if the ISP Service provides
more than 1 IP address ,then it can vary.

It depends on which router you are using and you have to log into...

You want to access internet without any problem.

Are you using any Local DNS Server?

If you are then try to ping the IP address of that Local DNS Server and if your ISP Service has provided the...

Yes your computer from which you want to access your LAN must have internet service running either using a dialup or
DSL and the LAN that you want to access must have an internet access as well.
...

You should make your that the WAN interface of the router has a Public IP address which is either assigned by the ISP Service .
They might install a Modem in your home and assign it a public IP...

Your IE6 must have come with your WinXP
Installation CD and when you installed WinXP ,the IE6 was added to your OS by default.

Is it necessary for you to use IE?

Just try to use IE updates...