The settings for the Windows Time Service exposed through group policy have long been seen as a bit mysterious, and for good reason. Well, today we will take the first steps towards remedying that problem. After spending a good amount of time with one of my favorite writers (thanks Kurt!), we have developed a revised text for explaining these group policy settings.

Keep in mind that this is simple text. The prupose is not to explain every scenario where these values should be changed or which environments dictate that a change be made. Rather the point of this text is simply to provide a better understanding of what these values are, what effect they will have on the Time Service, and what values are applicable when adjusting these settings.

http://blogs.msdn.com/w32time/pages/group-policy-settings-explained.aspx

Enjoy!