I spent some time recently updating the SheppyBrew Website.
The tech stack used on the site was very out of date and making any code changes to the site was very difficult.
If you're a computer geek at all, you could probably tell with the use of .aspx pages, and the fact that it really was not great on smaller screens.
But, really the main reason I felt I had to get the thing updated was that my hosting company sent me an email letting me know that support for the version of .NET was being removed from their servers "sometime this quarter".