Automatic calendar sync between exchange and google calendar

Hey there,

I've got a question:
I've got several calendars at my mobile phone - including an exchange calendar from my job.
All calendars are available at my Google account and accessible via browser, except the one from my job. At the office, the Exchange prohibits publishing any calendars, but since I've got it available at my mobile phone: Is there a way to make the exchange calendar accessible via Google calendar at any browser?
An app which would automatically copy any changes from the exchange calendar into one of my Google calendars would be perfectly fine :)

So.. Does anybody got a trick or hint for me?
Thanks a lot in advance
Hendrik