Hi,
My understanding is this.
MS Outlook 2000 IS the client.
MS Exchange is often the server end...
...and there IS a web based interface available to an Exchange server.
So I guess I'm saying it doesn't make sense to have a web based client to access the Outlook client, so in a sense you are correct...
...but the essence of the question (I believe) is "Can you access exchange data with a web based interface as well as with the Outlook client"
...and the answer to that is Yes.
AND having re-read your question... you could be asking whether you can use Outlook to access web based mail in the same way a browser does. The answer to that is also Yes. In fact, you can surf the internet in the Outlook client if you really wanted to... I wouldn't though.
Cheers,
Tim.