Outlook 2007 share calendar permission issue

Hi,

We are using Outlook 2007 to share calendar.

Here's our story:

We have configured "default" permission as "reviewer" so that everyone could check shared calendar, but what we need is that how to forbit others opening calendar items from calendar view screen.

All in all, we would like to share calendar with everyone and prevent them from opening the calendar item and see the detail.

Any suggestion will be appreciated.

Thanks,

Rowen