Hello Frank, By default, managed computers contact the SCE server to check for updates approximately every 22 hours. Then, the softeware will be installed on the scheduled time. Or you can run the command "wuauclt /detectnow" and "wuauclt /reportnow" on the managed computers to force them to detect and install any available updates. For the steps of deploying updates and Service Packs, we have disscussed it here: How to deploy Service Pack 3 of Windows XP through SCE 2010 http://social.technet.microsoft.com/Forums/en-US/systemcenter/thread/38850562-ad3c-4fc4-8f75-8c91498564d7 Thanks, Yog Li -- Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.