Q: I work with mixed environments, and we have been trying to put together a definitive plan for updating out clients. We thought we had one and then microsoft aired its DST webinar yesterday and now we are uncertain about the order to apply the updates
A: Please follow following patching order for DST patching...
1. Install OS patch on servers (http://support.microsoft.com/kb/931836)
2. Install OS patch on clients (http://support.microsoft.com/kb/931836)
4. Install Exchange DST patch for CDO (http://support.microsoft.com/kb/926666)
In organizations where OWA is not used to schedule appointments, step 4 can be performed before step 3, if desired. Please see http://blogs.technet.com/dst2007/archive/2007/03/01/should-you-run-the-cdo-update-before-or-after-rebasing.aspx for more details.