BlackBerry Enterprise Server may not work correctly in Microsoft Exchange 2007 environments without public folders

How kewl is this ..  not! .. looks like it all down to Free/Busy lookups

Source: http://www.blackberry.com/btsc/dynamickc.do?externalId=KB15582&sliceId=SAL_Public&command=show&forward=nonthreadedKC&kcId=KB15582

Microsoft Exchange 2007 can be installed without public folders for environments with Microsoft® Outlook® 2007 and later as the messaging application. By default, the BlackBerry Enterprise Server requires public folder access. If public folders are not present, some functionality may be lost.