Question about Outlook Express

I am deploying Office 2011 to over 100 Macs and want to make Outlook 2011 the default program for all email, calendaring and contacts.  I would like to set that option using a shell script since we are deploying Office via Casper.  I noticed that when I select that option in the GUI in Preferences, the com.apple.LaunchServices.plist file is updated.  So in my script, I use plistbuddy to make the changes and the plist file indicates that Outlook is the default for all of those options.  But when I go into Outlook, the checkbox for that option is still not checked.