Default Calendar Permissions for new users

Hey folks,

We noticed with our Exchange 2010 and 2008 AD, when we create a new user and set them up for email, their default calandar sharing permissions are set automatically to Free/Busy Time.  We're finding we have to go back and change the settings either in outlook or run a script in shell.

Can we change that default permission at the set up of the new user vs. having to back and tweak the permissions?

Thanks!

JS