How to subcribe to a published Outlook calendar in iCal

I use MS Outlook for work and iCal for my personal calendar.... I use my iPhone for business and personal use. I can't use MS Exchange on my iPhone to sync my Outlook calendar without it overwriting my iCal appointments.

I have published my MS Outlook calendar [privately] and want to subscribe to it in my iCal, but have been unsuccessful.

Do I need to work-around it somehow by subscribing to it from Entourage, Google, Yahoo! etc first then subscribe to that calendar? I'm game with any work-around; whatever will work, I have tons of appointments I need to track that are business and personal. Using MS Outlook directly for any personal use is out of the question.

Bottom line - I want my MS Outlook calendar (work calendar) merged with my iCal (personal calendar) so I can have both on my iPhone.

Thank you in advance for your help!

Erica