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