Simon Blackstein submitted a comment to this post about his experience with Outlook RPC over HTTP with Apache 2.0. His comment is a great addition to the OWA 2K/2K3 Front-end SSL Proxy with Apache 2.0 HOWTO.

You can find his comment here:

• http://3cx.org/item/46#rpcoverhttp

Keep in mind I have not yet tested his method. I half-heartedly tried getting RPC over HTTP working when I initially moved my OWA proxy to Apache 2.0, but found nothing but failer. Minus a few admitted glitches, Simon apparently has it working well. Hopefully he'll comment more when he gets all the kinks worked out.