Exchange 2003 SP2 - forced cache mode - HOW?

One of the main selling points of SP2 was the fact that you can force clients into cached mode. I'm (guessing?) that it is done with a GPO or some option buried somewhere in System Manager I simply can't find. I will look through the SP2 docs again but other people are having the same problem finding it.. It's not essential for my rollout but it sure would be handy to know. Anyone know?

Answered! Thanks to anonymous user JC:

http://download.microsoft.com/download/f/b/5/fb5c54af-fe5c-48e9-be97-f9e8207325ab/Ex_2003_SP2_RelNotes.htm

under the section "Enabling or Disabling MAPI Access per User"