change default calendar permissions inexchange 07

now that I've migrated all my users to exchange 2007 from 03 my users can no longer see other users calenders with out having to send an email requesting permission.
i want to set it up so everyone can see everyone's calendar.
is there an easy way to set this up?
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Even with all the additions to Exchange 2007, unfortunately it can't do this out of the box.  If you can wait until Exchange 2010, you might be happier, but currently with Exchange 2007 you need a third-party tool or script.

Here's a couple of resources to get you started - come back with any further questions once you've looked into this:

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