Setting up RPC over HTTP on Exchange 2003

I'm attempting to migrate Exchange 2003 mailboxes to Exchange online. I've been following these guides on setting up RPC over HTTP:

https://www.petri.com/how-can-i-configure-rpc-over-https-on-exchange-2003-single-server-scenario
http://www.msexchange.org/articles-tutorials/exchange-server-2003/migration-deployment/Implementing-RPC-over-HTTPS-single-Exchange-Server-2003-environment.html

I've enabled the RPC over HTTP Protocol from Add/Remove components in Windows, and in the articles it seems to suggest that this should generate an RPC virtual directory in IIS under default website, however this isn't the case on my system, there's no RPC virtual directory, however there is an "rpcproxy" directory in C:\Windows\system32 with today's date under the Date Modified field, and a dll file inside.

The other thing I noticed (and this wasn't in the articles so I may be barking up the wrong tree here) was an "RPC-HTTP" tab under Exchange System Manager when I look at the properties of the mail server. There I have the option to set it to an RPC-HTTP back-end server, but I'm not sure what the implications are if I click that, and this is a live server so was wondering if anyone can shed any light on this please as I can't find any succinct information from scouring the web. I can tell you that there's no front-end exchange server in our setup, we have 2 single 2003 Exchange server.
F SAsked:
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AmitIT ArchitectCommented:
I suggest you to check one more time, if it is enable properly. Also review this article:
http://www.msexchange.org/articles-tutorials/exchange-server-2003/migration-deployment/Implementing-RPC-over-HTTPS-single-Exchange-Server-2003-environment.html

When you enable it, make sure all other windows are closed.
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F SAuthor Commented:
Hi Amir, thanks for the reply, but actually that's the same article I posted in the OP!

I have quadruple checked the setting is enabled. I'm going to reboot the server in 30 mins (been waiting for out of hours slot) so hoping that will resolve things.
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AmitIT ArchitectCommented:
Before restart, do IISreset.
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F SAuthor Commented:
I restarted the system before I saw your comment, so that will have restarted IIS in any case - still no sign of it:

IIS
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AmitIT ArchitectCommented:
I can see other sites also in your screen shot above. What are those sites?
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F SAuthor Commented:
It's another service we're running, should be no conflicts there.
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AmitIT ArchitectCommented:
Can you expand other sites and paste the screenshot.
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AmitIT ArchitectCommented:
Do you have any update?
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F SAuthor Commented:
Given up on this, wasting too much time - using a 3rd party tool to migrate which doesn't need this feature.

thanks for your time Amit
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AmitIT ArchitectCommented:
Provided all required answer and followed up. However user choose 3rd party tool. Technically, the answer I am selecting fits this question. If any objection, please click object button and give valid reason.
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