Sorry, I almost forgot about this post. I put together an example of how you would do what I was talking about; attached is the RDL so you can just plug it into BIDS or SSDT and run it.

Note the screen shot below...

The report has just one parameter called @TheDate; that's your calendar control.

There are two datasets: SampleData and DateChecker. SampleData feeds the report (it's just nonsense for demo purposes); DateChecker takes @TheDate as a parameter and returns the text, "too old" if @TheDate is older than 60 days; NULL otherwise. It uses this query:

SELECT CASE WHEN @TheDate < getdate()-60 THEN 'too old' END AS datestatus

(note that I prefer SQL to SSRS expressions)...

The Report Body has two items, a tablix and a textbox with my custom error message :hehe: . The textbox is visable based on this expression:

=First(Fields!datestatus.Value, "DataChecker") <> "too old"

The tablix is visable based on

=First(Fields!datestatus.Value, "DataChecker") = "too old"

I got them backwards, but you get the point...

Hopefully that's enough to help you figure out what I'm talking about.

For the Visibility settings for my Text box