Actually, the documentation for the product is just fine. No documentation is perfect, but as a new eSupport Suite licensee, we had no issues getting the product up and running in our environment. As for "finding" the documentation, do this:
1) Visit
www.kayako.com
2) Hover mouse over the "Support" menu option at the top
3) Select "Downloads" from the menu that appears
4) Click the "SupportSuite v3 Manual (PDF)" link
5) Click the "Download" button
The parser either needs emails fed directly to it or you need to configure the parser to go fetch them as a POP3/IMAP client.
How to pipe when your incoming MTA is Microsoft Exchange is a Microsoft Exchange documentation issue. However, the eSupport documentation does state that Windows users can only use POP3/IMAP Account Polling, and not piping, so maybe Microsoft Exchange doesn't offer piping as a feature.
While I personally prefer email piping, eSupport does not have any internal SPAM filtering (at least not yet), so we have ours POP3 polling every 2 minutes, since our mail server runs SPAM detection software and catches much of the SPAM we receive. Until there is built-in SPAM detection software, I'd recommend this method.