I deal with RPC over HTTP quite a bit at my job. I like it, and think it's a great feature. Setting it up can be a little bit tricky, but once it is up and running it works very well.
If the client is running Windows XP SP2 they should not have to install the patch to use RPC over HTTP. If you need the link to that patch, or have some questions or problems (ie... Patch installed, but the Exchange over the Internet feature still does not show up on the client) I have some batch files and regkeys that make it show up.
Let me know if you have any client side questions.
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