How to find AD schema update history using PowerShell
This article is for all of the IT Pros who have inherited an Active Directory environment which they did not build. Today's post offers some simple scripts to document the history of schema updates. This is particularly handy when it comes time to extend the schema for a domain upgrade or Exchange implementation. Now you can get a report of every attribute's create and modified date. You can also find out if and when third party extensions have been applied.
The full post has been published over on the Hey Scripting Guy blog. Follow this link to get the article and script.