MS Exchange Wisdom Needed

Ok, this is for all of you really smart people out there.

I have a client who has 5 computers and Windows 2000 SBS server and at this point, they are not able to send or receive email. Everything was good until a point in time when their ISP changed names and changed POP3 and SMTP. I have made some changes both in Exchange and in Outlook, but nothing helps.

I actually have a few years experience with Exchange, I have been in churches and other offices where Exchange is running and my experience is like this:

Yep, there’s Exchange, everything’s good in Exchange. Add a new user, remove a user, set up email blah blah blah

I’ve never had an occassion to get deep into Exchange, until now. It looks simple but apparently I’m missing something.

So here is my request, I need to do one of the following:

1. Fix Exchange to do what it’s supposed to do
2. Disable Exchange so I can pull e-mail directly off of the web server using SMTP and POP3

Any guidance anyone can give me would be great. I mentioned this situation to one person recently, hoping to draw from his knowledgebase of experience and wisdom in tech things such as this, stating that I was no Exchange expert and his response was that he didn’t think anyone was an Exchange expert, but offering nothing more.

If I can find someone that knows a little more than I do about this, then I will be alot better off. By the way, the person that set the server up is long gone and so that is not an option, I’ve already gone down that road.

Thank you very much for any help that you can give me.

UPDATE: I just re-read this and it’s pretty vague. I think it has everything to do with the new ISP name and I don’t know if I have changed POP3 and SMTP settings in all the places I should, so that is where I really need some insight.

FINAL UPDATE: The problem ended up being less about Exchange and more about other issues.   It’s a relief because Exchange does not appear to be that much of a monster and everything I could see in there looked normal.  My challenge has been actually finding the time to devote to this issue, and there are more things going on and changing currently than should be happening at once.  Thanks for your comment, Kirk.  I agree with what you said, one of the issues is the website hosting, including DNS, and that’s the next step in this process.