More than 2010 upgrade readiness, this tool is a one stop 2007 best practices analyzer. Most 2007 farms have dozens of small customizations. Get started today because it will require time to take inventory and review the output. The results help build a deep awareness of your system configs. This command is read-only and safe to run in production any time, even during the work day.
So go ahead, RDP over and run “STSADM –O PREUPGRADECHECK” now!