>In that particular example, if you look for messages about C#, you might as well just use the calendar, go in .Net forum and select the C# category.

Not all messages that reference C# are in the C# category. In this particular case the message I was looking for was in the '.Net in general' category. Fortunately I remembered another word that also appeared in this message and was able to find it that way, but having the ability to search on 'C#' would have been much more convenient.