We have put countless hours into the task of trying to make sure that all pages in the new platform are still at the same URL so that things don't go missing. However, there will be times when you'll see a Missing Page Error.
Chrome extension To the Rescue!
Install the Wayback Machine Chrome extension in your browser. When you reach a page that is no longer available, click your WayBack Machine extension and it will search for old versions of the page you were looking for.
We also have a “Wayback Machine” Firefox add-on
A “Wayback Machine” Safari Extension
A “Wayback Machine” iOS app
And a “Wayback Machine” Android app