I have been trying to work out for some time, a really easy way for AutoDiscovery services in outlook to be directed to the correct address allowing for easy user configuration of services.

Without going into all the details, I have tried all the methods described in (yet another) Microsoft Whitepaper.

http://technet.microsoft.com/en-us/library/bb332063(EXCHG.80).aspx

Had some level of success but while working through this stuff I discovered by mistake a little discussed method.

A new feature is available that enables Outlook 2007 and later to use DNS Service Location (SRV) records to locate the Exchange Autodiscover service.

Discussed here: http://support.microsoft.com/?kbid=940881

To Hell with the the WhitePaper, this works fantastically well. It is everything that I need it to be.