One of the first steps in the SBS RipCurl (previous blog post on our RipCurl experiences & a RipCurl checklist PDF download) is to apply the KB926505 Vista and Outlook 2007 compatibility update.
It is now coming down to us as a critical update on WSUS:
Keep that in mind when considering to RipCurl your SBS boxes.
If you have approved the update in WSUS, and let it run via the Yellow Shield update installation request, then there is one less step to getting your SBS network Vista and Outlook 2007 compliant.
Microsoft KB 926505: Windows Small Business Server 2003: Windows Vista and Outlook 2007 compatibility update.
UPDATE: Added the above URL to KB926505.
Microsoft Small Business Specialists