We've all seen it happen. Two servers are configured the same way, but suddenly, one of them stops working. The content is same, everything looks right, but one server is exhibiting unusual behavior. You could try to take the config from the working server and overwrite the broken one. But that won't tell you what happened, nor if it might happen again.

There's also the case where you only have one server, which suddenly breaks. Restoring from backup if you have one or manually sifting through config might be your only option. But often the problem isn't easy to spot and backups take time and effort to restore.

Enter MS Deploy. You can compare two live sites, a site with an archive, or compare two archives. In this case, I'll show you comparison of a live web site and an archive. An archive is like a snapshot of a site or server at a given point in time. When you take the archive, you may be doing it for a manual backup, to do an offline sync or to make a copy of a specific version of your app. It's a great way to quickly take a snapshot of your working app (and config) before you make changes.

http://blogs.iis.net/msdeploy/archive/2008/02/02/using-ms-deploy-to-compare-sites-or-see-what-components-your-site-uses.aspx

via http://blogs.iis.net/msdeploy/archive/2008/01/22/welcome-to-the-web-deployment-team-blog.aspx

Technical Preview 1

x86
http://www.iis.net/downloads/default.aspx?tabid=34&g=6&i=1602

x64
http://www.iis.net/downloads/default.aspx?tabid=34&g=6&i=1603