Common Client Access Considerations for Outlook 2003 and Exchange 2010

How about putting it somewhere obvious in the Exchange 2010 technet documentation - under system requirements, for example (or at least in the "planning" section? At the moment, it's hidden away in "Understanding Client RPC Access" - http://technet.microsoft.com/en-us/library/ee332317.aspx.
I'm sure lots of people have been upgrading to Exchange 2010 now, followed by an upgrade from Office 2003 to 2010 later in the year. They are then hit by hit by the loss of UDP notifications and their user say "Exchange 2010 is much slower than the old version"!