It is a pain to scroll to the top in Messaging (both in Read Note and the list view).  Here is a work-around that works :-

In List view :-

  • Hit the right key to switch accounts
  • Hit the left key to go back.  You're on top!

In the read form :-

  • Hit back (in Smartphone) or the OK button (in pocketPC) to close the message
  • Action to open the message again.  You are on top!