[Mapserver-users] Atlas of Canada - Mapserver or ArcIMS ??

[Megan.Watson at ga.gov.au]

I'm about to write a document comparing Mapserver to ArcIMS - while checking out what ESRI have to say about ArcIMS I came across this reference to the Atlas of Canada:
http://www.esri.com/software/internetmaps/ims.html 

On the Mapserver Gallery page is a link also to the Atlas of Canada as a basic Mapserver app.

I was under the impression that the Atlas of Canada was a Mapserver application and have often pointed people in it's direction as a good example.

Can someone clarify what's going on here?  

Also, if anyone has done a similar comparison it'd be great to hear about it (I've had a look at the mailing list archive)

thanks
Megan Watson
Web Developer
Corporate Information Management & Access
Geoscience Australia
ph: 02 6249 9503