I for one am not going to shed an tear for ArcIMS. Don’t get me wrong, I was a user of ArcIMS from version 3.0 to 9.1. But since ArcGIS Server 9.2 as well as other open source mapservers, the need to even glance in its direction isn’t warranted. Usually when we talk about ArcIMS, a couple folks rush to its defense. Well go ahead and do that all you want – nobody is listening anymore, including Esri (kudos to Esri BTW on the sexy PDF in 2010). But you ArcIMS fans need not worry – I’m sure Esri will be collecting maintenance on ArcIMS for years to come.